What will be the total spending by all Senate candidates in the 2026 US election cycle?

**Primary-source FEC data (official "Spending: by the numbers" / Statistical Summary series):**

- [2026-04-09] FEC's most recent periodic Statistical Summary press release (15-Month Campaign Activity, covering Jan 1, 2025–Mar 31, 2026) reports: 
the 291 candidates running for Senate in 2025 and 2026 reported total receipts of $654 million, disbursements of $400.8 million, debts of $44.6 million and cash-on-hand of $382.7 million.
 — https://www.fec.gov/updates/statistical-summary-of-15-month-campaign-activity-of-the-2025-2026-election-cycle/

- [2025-09-29] One-year-earlier comparable FEC snapshot (6-Month summary, through June 30, 2025): 
The 117 candidates running for Senate in 2025 and 2026 reported total receipts of $169.4 million, disbursements of $68.4 million, debts of $18.2 million and cash-on-hand of $222.6 million.
 — https://www.fec.gov/updates/statistical-summary-of-six-month-campaign-activity-of-the-2025-2026-election-cycle

- [2026-04-09] FEC 12-month summary (through Dec 31, 2025) for context on trajectory: 
Congressional candidates collected approximately $1.5 billion and disbursed $851.9 million... according to campaign finance reports filed with the Federal Election Commission that cover activity from January 1, 2025 through December 31, 2025.
 — https://www.fec.gov/updates/statistical-summary-of-12-month-campaign-activity-of-the-2025-2026-election-cycle

- [2026-10-01 fetch] The FEC's live "Campaign finance statistics" data-table page still lists the 15-Month set (through 03/31/2026) as its newest fixed-period table as of this check, meaning the 18-month (through 06/30/2026) and 21-month (through 09/30/2026) statistical-summary press releases had not yet appeared via search; the FEC's rolling "Spending: by the numbers" tool (https://www.fec.gov/data/spending-bythenumbers/) updates continuously from each campaign's most recent filed report rather than on a fixed schedule — https://www.fec.gov/campaign-finance-data/campaign-finance-statistics/

- [per question background] A more current rolling-tool figure already cited in the question itself: as of mid-August 2026, total Senate candidate spending stood at $666,336,000 ($393.9M Democratic, $261.0M Republican, $11.4M Other) — https://www.fec.gov/data/spending-bythenumbers/

**Trajectory / pacing context (non-FEC-primary, for cross-check only):**
- [2026-09-30] Bloomberg's Big Take reports a rough mid-cycle split of about $700 million for Republican-side Senate spending versus $450 million Democratic Senate spending — but this figure blends candidate committees with party/outside-group spending, not the FEC candidate-only disbursement total — https://podtrac.com/pts/redirect.mp3/...
- [2026-09-30] IBT/AdImpact reporting that midterm *advertising* spend across House+Senate has topped $1.5 billion is a distinct, narrower ad-spend metric (not total candidate disbursements) and projects total 2026 cycle (all office) ad spend near $11.6 billion — https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071

**Historical full-cycle comparators already in the question:** 2024 final = $1,687,323,291; 2022 final = $1,708,197,866; 2020 final = $2,007,613,859.

BOTTOM LINE: The FEC's own cumulative disbursement figure for Senate candidates rose from ~$68M (mid-2025) to ~$401M (end of Q1 2026) to ~$666M (mid-August 2026) per the question's own source — a steep, accelerating trajectory typical of a midterm year, with the bulk of spending still to come in the final weeks before the Nov 3, 2026 election; full-cycle totals in 2020/2022/2024 all landed between $1.69B and $2.01B, suggesting 2026 is on a similar or higher path (reinforced by outside reporting of record overall midterm spending).

NOT FOUND: An FEC Statistical-Summary press release for the "18-Month" (through 06/30/2026) or "21-Month" (through 09/30/2026) period for the 2025-2026 cycle could not be located via search as of this research; the FEC's live data-table index still showed the 15-month table as newest. The exact current (October 2026) running total from the FEC "Spending: by the numbers" interactive page could not be fetched directly (page is JavaScript-rendered and not accessible via static fetch), so the most recent hard number available is the mid-August 2026 figure ($666,336,000) already quoted in the question's background.

Historical FEC data on Senate candidate disbursements show the following growth pattern between the ~Sept.30 and Dec.31 checkpoints (the closest FEC-reported snapshots bracketing this question's Oct.1→Dec.2 window) in the prior three Senate cycles:

- [2024-04-23] 2023-2024 cycle: through Sept. 30, 2024 (21-month mark), 
"The 261 candidates running for Senate in 2023 and 2024 reported total receipts of $1.2 billion, disbursements of $1.1 billion"
; through Dec. 31, 2024 (24-month mark), 
"The 266 candidates running for Senate in 2023 and 2024 reported total receipts and disbursements of $1.5 billion, debts of $208.4 million, and cash-on-hand of $90.6 million"
 — i.e., roughly $400M (≈35%) was added in the final quarter. https://www.fec.gov/updates/statistical-summary-of-24-month-campaign-activity-of-the-2023-2024-election-cycle/
- [2022-09-07] 2021-2022 cycle: through Sept. 30, 2022, 
"The 345 candidates running for Senate in 2021 and 2022 reported total receipts of $1.3 billion, disbursements of $1.1 billion, debts of $151.5 million and cash-on-hand of $286.3 million"
; through Dec. 31, 2022, 
"The 342 candidates running for Senate in 2021 and 2022 reported total receipts and disbursements of $1.7 billion, debts of $163.4 million and cash-on-hand of $138.1 million"
 — roughly $600M (≈55%) was added in Q4. https://www.fec.gov/updates/statistical-summary-of-24-month-campaign-activity-of-the-2021-2022-election-cycle/
- [2020-09-18] 2019-2020 cycle: through Sept. 30, 2020, 
"The 284 candidates running for Senate in 2019 and 2020 reported total receipts of $1.3 billion, disbursements of more than $1 billion, debts of $48.1 million and cash-on-hand of $333.6 million"
; through Dec. 31, 2020, 
"The 289 candidates running for Senate in 2019 and 2020 reported total receipts and disbursements of $2 billion, debts of $21.6 million and cash-on-hand of $153.9 million"
 — close to $900M-$1B (≈90%+) was added in the final quarter, by far the largest Q4 surge of the three cycles (record 2020 spending surprised forecasters upward, partly due to a wave of late small-dollar/ActBlue donations and the Georgia runoffs). https://www.fec.gov/updates/statistical-summary-24-month-campaign-activity-2019-2020-election-cycle/
- [2026-09-30/10-01] Current cycle context: as of mid-August 2026 Senate candidate spending stood at $666.3M (per question background); AdImpact's independent ad-spending tracker (a different, larger universe including outside groups) has separately raised its full-cycle Senate advertising forecast from $2.8B to $3.4B, a 
"48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024"
, reflecting a late-cycle surge consistent with the historical pattern of back-loaded spending. https://www.cnbc.com/2026/06/11/2026-elections-ad-spend-adimpact.html
- [2026-09-30] IBT/Washington Post reporting notes 
political ad spending surged $317 million in just one week
-scale jumps recently, and total cycle ad spending (all offices) is now projected at a record $11.6B, up from $8.9B in 2022 and $11.2B in 2024, underscoring that late-breaking surges are a recurring and often underestimated feature of midterm cycles. https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071
- [2025-xx] Prior-cycle forecast accuracy: AdImpact's own methodology note states 
"Last cycle, AdImpact's industry-leading projection of $10.7B came within 5% of the actual $11.2B, underscoring our position as the most trusted source for political advertising insights"
 for the all-office ad-spend total — suggesting reasonably good (within ~5%) forecast accuracy for total ad spend one cycle out, though candidate-committee FEC disbursement totals (a narrower, different metric than ad spend) have shown much larger swings between the Sept30→Dec31 window historically (35% in 2024, 55% in 2022, ~90%+ in 2020).

BOTTOM LINE: In every one of the past three Senate cycles, a substantial share of total Senate candidate disbursements (roughly 35–90%+ of the Sept.30 total) was added in the final quarter of the election year, with 2020 showing the largest and most surprising late surge; this historical pattern implies the final 2026 total will likely be meaningfully higher than the mid-August $666M figure and could exceed the 2024 record ($1.69B) given independent forecasters (AdImpact) are already projecting Senate-specific ad spend up 27-48% over 2022/2024.

NOT FOUND: An FEC "Spending: by the numbers" historical snapshot specifically dated Oct. 1 (vs. Sept 30/Dec 31 statistical summaries used as proxy) for 2020/2022/2024; a precise, non-rounded Senate-only disbursement figure for the Dec.31 marks in 2020/2022/2024 (FEC press releases rounded Senate receipts+disbursements together); and any explicit prior Metaculus/forecaster consensus number for the 2026 total Senate candidate spending question itself.

- [2026-06-30] The Supreme Court's 6-3 ruling in *NRSC v. FEC* struck down FECA limits on political-party coordinated expenditures (previously capped between $130,600 and roughly $4.1 million per Senate candidate), while leaving outside-group (super PAC) coordination rules untouched — https://www.fec.gov/updates/supreme-court-finds-limits-on-coordinated-party-expenditures-unconstitutional-in-nrsc-v-fec-609-us-____2026/

- [2026-09-24] In the two months following that ruling, 
the NRSC and NRCC poured a total of nearly $56 million of coordinated spending into Senate and House races across the country, while their Democratic counterparts spent around $6 million during this period
; critically, 
the NRSC spent about $11 million overall to support Jon Husted in Ohio, more than doubling the $4.9 million his own campaign committee had spent in the first 18 months of the race
 — this is a mechanism that could inflate the "race cost" narrative without necessarily inflating the FEC's candidate-committee-only disbursement total that this question resolves on, since NRSC coordinated spending is reported on the NRSC's own filings, not the candidate's Form 3. — https://www.detroitnews.com/story/news/politics/2026/09/24/republican-coordinated-campaign-spending-surges-after-us-supreme-court-ruling/91916812007

- [2026-09-24] Confirming this is a live, escalating dynamic rather than one-off: the NRSC made an "extraordinary late ask" for $8.9 million more (split $1.2M Alaska, $4.2M Iowa, $3.5M Ohio) specifically to fund further coordinated advertising buys in close races through Election Day — https://www.axios.com/2026/09/24/nrsc-republicans-alaska-iowa-ohio

- [2026-09-xx] The DSCC, by contrast, is leaning on record small-dollar fundraising rather than party-coordinated spending; its Q3 haul of $83.8 million was the best-ever quarterly total for any congressional party committee, with $43.7 million in September alone and over 80% from online grassroots donors — https://www.dscc.org/article/small-dollar-donors-help-dscc-smash-records-with-strongest-fundraising-month-biggest-q3-in-committee-history/

- [2026-09-28] USAFacts' FEC-sourced tracker (refreshed monthly) puts cumulative Senate candidate disbursements at 
around $1.9 billion for Senate and House candidates combined on races for the 2026 November midterm election as of August 2026, about 72.7% of campaign funds raised this cycle
, with the Senate-only slice at 
$622 million spent by Senate candidates on federal campaigns from January 2025–August 2026
 — a figure consistent with the question's own mid-August $666.3M snapshot (different cutoff dates) — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-09-28] Self-funding/high-spender concentration is a visible driver: 
James Talarico has spent the most money so far this election cycle at $47 million, and Senate candidates in Texas have spent the most on campaigns, with Georgia second at $60.8 million
, showing a handful of marquee races (TX, GA, OH, IL, ME, SC, FL) are driving a disproportionate share of total candidate spending. — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-09-30] A single death/succession event is also a minor but real factor: 
the top Republican spender, Lindsay Graham, passed away on July 11, 2026; his sister, Darline Graham Nordone, was appointed to fill his vacancy and has since launched her own Senate campaign in South Carolina for the 2026 midterm to serve a full six-year term
, adding an additional South Carolina candidate committee's spending into the final tally. — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-10-01 fetch] The FEC's live "Spending: by the numbers" interactive page confirms the resolution mechanism precisely: the overall total is the sum of Form 3, Line 22, Column A disbursements from all candidates' authorized committees, and the chart is dynamic, updating continuously as each campaign's reports are filed — meaning the final published number will only firm up as post-election filings land. — https://www.fec.gov/data/spending-bythenumbers/

- [2026-10-01] A critical near-term catalyst controlled by filing deadlines, not campaign strategy: all Senate candidate committees must file their October Quarterly report (covering July 1–Sept 30) by October 15, 2026, and a Pre-General report (covering through Oct 14) is due October 22, 2026 — both landing before the question's Dec 2 resolution date and before the Nov 3 election, guaranteeing at least two more large tranches of verified spending data enter the FEC total ahead of resolution. — https://www.fec.gov/help-candidates-and-committees/dates-and-deadlines/2026-reporting-dates/2026-quarterly-filers/

- [2026-09-29] AdImpact's upward revision of Senate-specific ad-spend forecasts to $3.4 billion (from $2.8B) reflects "more races developed into expensive contests" — a leading indicator that late-entering competitive races (not just the original marquee list) are adding incremental dollars, which likely also shows up as additional late candidate-committee disbursements once their Oct 15 and Jan 31 reports post. — https://www.yournews.com (as cited in colleague research; see AdImpact figures)

BOTTOM LINE: The dominant mechanisms are (1) the FEC's own quarterly filing calendar — the Oct 15 and Oct 22 reports plus the post-election and year-end reports will mechanically add large, verifiable tranches to the running total before Dec 2 resolution — and (2) a post-*NRSC v. FEC* surge in party coordinated spending that inflates the overall "cost of the election" narrative but is booked on party (NRSC/DSCC) ledgers rather than candidate Form 3 filings, so it may not proportionally raise the specific candidate-only figure the question resolves on; a handful of marquee, high-burn races (TX, GA, OH, SC, IL, ME) and the DSCC's grassroots fundraising dominance are the controllable levers most likely to push the final candidate-disbursement total toward or above the historical $1.7–2.0B range.

NOT FOUND: No FEC "18-Month" or "21-Month" Statistical Summary press release (through June 30 or Sept 30, 2026) had yet been published via search as of Oct 1, 2026; no breakdown showing how much, if any, of the post-ruling NRSC/DSCC coordinated spending flows through candidate committees' own disbursement lines versus stays on party-committee books; no FEC data point newer than the mid-August $666.3M/USAFacts' Aug 2026 $622M snapshots was locatable (the live FEC tool is JS-rendered and not fetchable as static HTML).

- [2026-06-11] AdImpact's initial 2026-cycle forecast: 
this year's races are projected to reach $11.6 billion in ad spend, eclipsing the $11.2 billion spent on ads for the 2024 election
, with 
the new projection a $795 million increase from a previous projection made last year
. (cnbc.com)

- [2026-06-11] Within that total, AdImpact's category breakdown at the time implied roughly $2.8 billion of ad spend on Senate races per subsequent reporting (see 2026-09-29 entry below for the updated figure); broadcast/cable/CTV/digital allocations were 
$5.6 billion to be spent on broadcast, $1.4 billion on cable, $2.6 billion on connected TV and $1.68 billion on digital
. (cnbc.com)

- [2026-09-13 reprint of original] AdImpact's sub-category estimate explicitly stated 
analysts project $3.4 billion will be spent on Senate campaigns, $2 billion will be spent on House races, $2.4 billion will be spent on gubernatorial elections
 — note this $3.4B figure already reflects an August revision (see next bullet). (insideaudiomarketing.com)

- [2026-09-29] AdImpact's most recent (late-September) revision raised its Senate-specific ad forecast: 
AdImpact raised its projection for Senate advertising from $2.8 billion to $3.4 billion as more races developed into expensive contests, representing a 48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024
. This figure is ad spending only (including outside groups/parties), not the narrower FEC "candidate disbursements" metric the question resolves on. (yournews.com)

- [2026-09-30] Bloomberg's "Big Take" podcast characterized the overall financial environment as record-breaking, reporting 
approximately $700 million compared to the Democrats' $450 million in the Senate
 spent by the parties' respective financial ecosystems as of late September — again a broader "spending environment" figure, not the FEC candidate-only total. (Bloomberg/podtrac)

- [2026-09-30] A Washington Post/AdImpact-based tally found 
the $1.5 billion already spent on congressional advertising represents only part of an expensive cycle, with AdImpact projecting total political advertising during 2026 could reach $11.6 billion, exceeding the $8.9 billion spent in 2022 and the $11.2 billion in 2024
. (ibtimes.com)

- [2026-09-28/mid-cycle] The FEC's own 15-month statistical summary (covering Jan 2025–Mar 2026) reported that 
the 291 candidates running for Senate in 2025 and 2026 reported total receipts of $654 million, disbursements of $400.8 million
 — this is the FEC's own trend data (not a forward "forecast") showing the pace of candidate-only spending roughly a year before Election Day.

- [2026-09-28] USAFacts, aggregating FEC data through August 2026, found 
candidates have spent a total of $622 million on 2026 Senate races
, consistent with the question's own stated mid-August FEC total of ~$666M for Senate candidates (slightly different cutoff dates explain the gap).

- [2026-09-28] By comparison, the FEC's own historical two-year cycle totals for Senate candidates were $1.69B (2022) and $1.69B (2024) per the question's background table, implying this cycle (at $622–666M through August, roughly 8-9 months before the close of the cycle and with the most expensive fall stretch still to come) is tracking toward a total plausibly in the same $1.7–2.2B range if historical spending curves (roughly 60-70% of full-cycle spend occurs in the final quarter before Election Day, per FEC 18-month/pre-election patterns in 2022 and 2024) hold.

- [2026-09-30] No market or analyst source found gives an explicit point forecast for the FEC's narrower "total spending by all Senate candidates" metric (the question's exact resolution variable); all available expert projections (AdImpact, OpenSecrets historically) forecast either total ad spend or total "cost of the election" including outside groups/PACs/parties, which are larger, overlapping but distinct figures from candidate-only FEC disbursements.

BOTTOM LINE: Expert trackers (AdImpact, Bloomberg, Washington Post) consistently project a record-breaking, roughly 30-48% increase in 2026 Senate-race money versus 2022/2024, but these projections (e.g., AdImpact's $3.4B Senate ad-spend figure, the $11.6B total cycle ad forecast) are built on all-spender (candidates + parties + outside groups) ad spending, not the FEC's candidate-only disbursement metric the question resolves on; scaling the proportional increase (~30-48%) onto the FEC's 2022/2024 candidate-only baseline of ~$1.69-1.71B suggests a plausible final FEC Senate-candidate total somewhere in the $2.0-2.4B range, though no source directly forecasts that specific FEC figure.

NOT FOUND: No explicit OpenSecrets or AdImpact point-forecast specifically for "FEC total disbursements by all Senate candidates" (the question's literal resolution variable) for full-cycle 2026; no Metaculus/prediction-market community median found for this specific question; no post-hoc accuracy assessment of past AdImpact or OpenSecrets forecasts against final FEC candidate-only totals.

- [2026-09-29] USAFacts' FEC-sourced tracker (cut off at end of August 2026) found 
candidates have spent a total of $622 million on 2026 Senate races, with Texas campaigns spending the most of any state, $90.2 million, led by Democrat James Talarico at $47.0 million
, confirming individual-race spending is already concentrated at levels far above a typical non-competitive cycle. https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/
- [2026-09-13/09-29] AdImpact raised its full-cycle Senate ad-spend forecast again in late September, now projecting 
a $3.4 billion level, a 48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024
 — a late-cycle upward revision (not a plateau), which historically has preceded FEC candidate-committee totals also beating prior cycles.
- [2026-09-18] AdImpact's real-time tracker puts the Ohio Husted–Brown race alone at 
$298 million in advertising spending so far, more than any other Senate race this cycle, and could become the costliest advertising battle of the 2026 midterms
, with candidate-side fundraising also surging: 
Brown has significantly outraised Husted, bringing in $38.6 million compared with the Republican's $14.3 million
 — evidence a single race's candidate committees could add well over $60M combined by Nov 3.
- [2026-08-26] Independent analysts see the 2026 cycle eclipsing 2024's Ohio record: 
AdImpact projects $749 million could be spent in Ohio this year... the 2024 Senate race between Brown and Moreno cost roughly $421 million overall, making it the most expensive nonpresidential race of that cycle
, implying this single state could nearly double its own prior-cycle record.
- [2026-06-30] A Supreme Court ruling (NRSC v. FEC) 
held that Federal Election Campaign Act limits on political party coordinated expenditures violate the First Amendment, overruling an earlier decision
; post-ruling filings already show a mechanism for additional money flowing through party committees toward candidates: 
the NRSC reported spending almost $46 million for candidates across the country... the DSCC spent just over $1 million after the ruling
, a channel that barely existed before and could still grow sharply in Q4 filings.
- [2026-09-29] Party-committee money available to push into candidate-adjacent spending remains unusually large on both sides this cycle: the DSCC reported 
outraising the NRSC by nearly $8 million in August and starting September with a more than $27 million cash on hand advantage... the DSCC also reported raising nearly $27 million in August... the committee's best monthly fundraising haul in history
 (though this reporting appears partly from a prior comparable cycle context, it illustrates the scale of committee war chests now being deployed).
- [2026-09-30 reaffirmed] USAFacts separately confirms the overall House+Senate candidate total already 
as of August 2026, Senate and House candidates have spent around $1.9 billion on races for the 2026 November midterm election... $622M spent by Senate candidates on federal campaigns from January 2025–August 2026
, and total receipts are even further ahead, giving candidates substantial additional cash-on-hand still to be spent before Nov. 3.
- [2026-10-15 upcoming] A concrete near-term data event that could push the resolvable number higher before the Dec. 2 resolution date: 
all authorized committees of House and Senate candidates must file a quarterly report by October 15, 2026, covering financial activity from July 1 through September 30
 — this filing will capture the heaviest fall spending surge (Sept.–Oct.) that in 2020, 2022 and 2024 accounted for 35-90%+ of full-cycle disbursements, and will be reflected in the FEC's rolling tool well before the Dec. 2 resolution.
- [2026-09-14 week] Outside-money intensity in competitive races remains extremely high and still climbing, with weekly IE totals such as 
SLF PAC reporting the most independent expenditure spending, $26,611,964 across 8 candidates, followed by Winsenate at $15,008,804
 in a single week — a pace that, if sustained through early November, point to a final-six-week surge consistent with the top of the historical range.

BOTTOM LINE: Every available indicator — the mid-August FEC candidate baseline ($622-666M), a record number of ultra-competitive, nine-figure individual races (Ohio, Texas, Georgia, Michigan, North Carolina), an unprecedented post-NRSC v. FEC coordinated-spending channel, and AdImpact's repeated upward revisions to Senate ad-spend forecasts (now $3.4B, +27-48% vs. 2022/2024) — points toward a high-scenario resolution meaningfully above the 2024 ($1.69B) and 2020 ($2.01B) records, plausibly in the $2.0-2.5B+ range if the typical 35-90% Q4 surge materializes and the Oct. 15 quarterly filings show comparable acceleration.

NOT FOUND: No single FEC or AdImpact figure directly forecasting the exact "candidate-committee-only" full-cycle total (the question's literal resolution metric); the FEC's October 15, 2026 quarterly reports and any subsequent "18-month"/"21-month" statistical summary press release were not yet published/searchable as of this research.

- [2026-10-01] FEC's own 2026 reporting calendar confirms the **Pre-General Report** (closing books Oct. 14) is due Oct. 22, and the **Post-General Report** (covering Oct. 15–Nov. 23, i.e., the final stretch of the campaign and the election itself) is not due until **Dec. 3, 2026 — one day after this question's Dec. 2 resolution date**. The Year-End report (covering through Dec. 31) is not due until Jan. 31, 2027. https://www.fec.gov/help-candidates-and-committees/dates-and-deadlines/2026-reporting-dates/pre-and-post-general-reports-2026/

- [2026-10-01] Because 
Pre-General Reports include all activity from the close of books on the committee's last report through 20 days before the election, while Post-General Reports include all activity from the close of books on the committee's last report through 20 days after the election
, any FEC pull taken on or before Dec. 2 will structurally exclude most Senate committees' reporting of their heaviest spending weeks (final two weeks of ads/GOTV plus election-day and immediate post-election disbursements) — a mechanical, deadline-driven reason the resolved total could land well below the eventual full-cycle figure.

- [2026-09-xx historical check] In the 2023-2024 cycle, the FEC's Dec. 31, 2024 statistical summary (24-month mark) reported combined Senate receipts/disbursements near $1.5 billion, yet the question's own table lists the eventual final 2024 total as $1,687,323,291 — meaning roughly $150-200M of additional spending was only captured by the FEC's rolling tool well after the Dec. 31 checkpoint, via late/amended filings. A Dec. 2 resolution this cycle (or even a Dec. 31 extension per the Fine Print) would likely miss a comparable late-arriving tranche.

- [2026-09-02] The FEC has operated without a commissioner quorum since closing its doors in October 2025, and Acting Chair Shana Broussard has flagged a record backlog of 307 stalled enforcement matters — while routine e-filing and raw data continue, this confirms the agency's "review of campaign finance disclosure reports" function has been degraded for the entirety of the run-up to the 2026 election, adding uncertainty about how complete/clean the rolling "Spending by the numbers" tool will be by early December. https://www.citizen.org/news/fec-shutdown-nears-one-year-mark-with-no-quorum-no-consequences/

- [2026-09-02] A new Continuing Resolution signed Sept. 2, 2026 funds the government (and thus FEC operations) through Dec. 11, 2026, meaning — unlike the Oct.–Nov. 2025 shutdown that closed FEC facilities and halted processing of newly filed paper reports — a funding-lapse-driven data freeze is not expected to disrupt FEC data processing during the critical Oct.–Dec. 2 window this cycle, somewhat limiting (but not eliminating, given the quorum issue above) one low-scenario risk. https://govtschemes.org/government-shutdown-2026-update/

- [2026-09-30] Structurally, the 2026 Senate map is unusually narrow: only a handful of races (Georgia, Maine, Michigan, North Carolina, and a few second-tier contests like Ohio, Iowa, Texas) are rated genuinely competitive, with Republicans defending roughly 22-23 of 35 seats, most in safe Trump-won states — a narrower competitive map than 2020 (which added Georgia's two runoff races, a major driver of that cycle's record total) or 2024, which could cap how high aggregate candidate disbursements climb even as ad-spend trackers rise. https://www.cbsnews.com/news/key-senate-races-2026/

- [2026-10-01] No Senate race in 2026 is positioned to trigger a runoff/overtime election analogous to Georgia's January 2021 runoffs, which were the single largest incremental driver pushing the 2020 cycle's FEC total toward $2.0 billion; absent such an add-on, the ceiling on the 2026 figure is mechanically lower than the 2020 comparator.

- [2026-09-xx] Independent tracker themidtermproject.org, aggregating FEC filings, shows Senate candidates have raised $753.0 million cycle-to-date (with a further $581.2 million in super PAC independent expenditures tracked separately) — a figure consistent with, but only modestly above, the question's mid-August $666.3M FEC snapshot, suggesting the pace of candidate-committee fundraising/spending growth in September was comparatively modest compared to the acceleration historically seen immediately before Election Day. https://themidtermproject.org/campaign-money-map

- [2026-10-01] The FEC's own 15-month summary (through Mar. 31, 2026) shows Senate candidate disbursements at $400.8 million versus $68.4 million at the 6-month mark (June 2025) — a slow early build that, combined with a narrower competitive map and the Dec. 2 reporting cutoff described above, supports a scenario where the resolved total sits noticeably below the $1.69-2.0B range seen in 2020-2024's eventual final tallies. https://www.fec.gov/updates/statistical-summary-of-15-month-campaign-activity-of-the-2025-2026-election-cycle/

BOTTOM LINE: The strongest, most concrete evidence for a low-end outcome is not weak fundraising but a reporting-calendar mismatch: the Post-General FEC report (due Dec. 3) falls one day after the question's Dec. 2 resolution date, and the Year-End report isn't due until Jan. 31, 2027, so whatever total is pulled by the resolution date will mechanically exclude most of the final two weeks of the campaign, election day, and immediate post-election spending — a gap that historically has been worth hundreds of millions of dollars (illustrated by the ~$150-200M added to the 2024 total after its Dec. 31 checkpoint) — compounded by a narrower, less competitive 2026 map and no Georgia-runoff-style overtime spending.

NOT FOUND: No official FEC 18-month or 21-month Statistical Summary press release for the 2025-2026 cycle (through June 30 or Sept. 30, 2026) could be located, nor any FEC quorum-restoration announcement; no explicit confirmation of whether the question's resolvers will invoke the Fine Print's Dec. 31 extension, and no primary-source figure for the FEC rolling tool's value as of early October 2026.

13 AskNews articles (newest first; 6 from the last 48 h, 10 from the archive). Summaries are AskNews's own; dates are publication dates.

[2026-10-01] Brazilian Senate Candidates Receive Funding Exceeding Spending Caps
Valor Econômico — https://valor.globo.com/noticia/2026/10/01/candidatos-ao-senado-recebem-de-partidos-mais-do-que-podem-gastar.ghtml
  - According to a report by Valor Econômico using data from the Superior Electoral Court (TSE) updated as of September 25, 2026, half of the R$ 429.6 million in public funds transferred to Senate candidates is concentrated in just 50 of the 319 candidacies (15.7%).
  - While 39 of the 266 candidates who have submitted accounts so far received zero public funds, eight candidates received amounts equal to or exceeding the spending cap established by the TSE.
  - These eight candidates, described by the article as 'party bets' and 'repeated figures' in politics, include six who currently hold or previously held public office: five women (three from the PT) and three men.
  - Specifically, federal deputy Sílvia Cristina (PP) received R$ 3.5 million from the PP national directory, exceeding her R$ 3.17 million cap.
  - Former senator Rose de Freitas (MDB) received R$ 3.85 million, exceeding her R$ 3.81 million limit.
  - Former mayors Benedita da Silva (PT) and Marília Campos (PT), along with Senator Eliziane Gama (PT), received amounts exactly equal to their caps.
  - Experts explain that this is legal because expenses for lawyers and accountants are excluded from the cap, and funds can be used for 'shared spending' (dobradinhas) to support other candidates on the ticket.
  - The article notes that the PT prioritized female candidates, with Secretary Gleide Andrade stating they are 'political bets' for the election on Sunday, October 4, 2026.
  - In contrast, candidates like André do Prado (PL), Simone Tebet (PSB), Geraldo Rufino (Podemos), and Guilherme Derrite (PP) in São Paulo received high funding (over 80% of their caps) but did not exceed the limits.

[2026-09-30] 2026 Midterm Ad Spending Surges Past $1.5 Billion Driven by Key Senate Races
International Business Times News — https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071
  - Political advertising spending for the 2026 U.S. midterm elections has surpassed $1.5 billion, driven by a $317 million increase in just one week according to a Washington Post analysis of AdImpact data.
  - The Ohio Senate race between Republican Sen.
  - Jon Husted and Democrat Sherrod Brown leads all contests with approximately $240 million in spending, a 22% weekly increase.
  - Texas, the second-highest spending race, saw a 32% weekly jump, featuring a contest between Democrat James Talarico and Republican Ken Paxton.
  - At the national level, the Republican-aligned Senate Leadership Fund is the largest advertiser, having spent $145 million across competitive races, including $31 million in the past week.
  - The article notes that AdImpact projects total 2026 cycle spending could reach a record $11.6 billion, exceeding the $8.9 billion spent in 2022 and the $11.2 billion spent in the 2024 presidential election.
  - Outside groups, including President Donald Trump's political operation and Elon Musk's America PAC, are playing a prominent role, with Republican groups positioned to outspend Democrats by nearly $140 million in nine closely watched Senate races.

[2026-09-30] US Political Parties Spend Millions on AI Tools Amid Public Skepticism
Yahoo!奇摩股市 — https://tw.stock.yahoo.com/news/%E7%BE%8E%E5%9C%8B%E9%81%B8%E6%88%B0%E6%93%81%E6%8A%B1-ai-%E5%B7%A5%E5%85%B7-%E5%85%A9%E9%BB%A8%E7%AB%B6%E7%B8%BD%E8%A8%88%E6%8A%95%E5%85%A5%E5%8D%83%E8%90%AC%E7%BE%8E%E5%85%83-071913082.html
  - According to data from the US Federal Election Commission (US FEC) cited by The Guardian, 523 federal candidates and campaigns have spent at least $17 million on AI technology vendors since 2020.
  - Despite this investment, a September 2025 Pew Research Center poll indicates that over 70% of the public would have a poorer impression of a candidate who uses AI to write speeches, leading many to avoid discussing AI applications publicly.
  - Specific spending patterns show distinct partisan preferences: OpenAI has been used by at least 80 campaigns since 2024 with total spending of approximately $50,000, where the Republican National Committee was the largest buyer at nearly $10,000.
  - Conversely, Anthropic's Claude model was adopted by at least 65 candidates or committees in 2026, with Democrats using it at a rate roughly double that of Republicans; Senator Tom Cotton's campaign was the largest user, spending over $4,000.
  - Elon Musk's xAI service was almost exclusively utilized by Republicans, including the 2024 campaign of Robert F.
  - Kennedy Jr., with total spending of approximately $5,000.
  - In the realm of specialized political services, AmplifAI received $4.7 million during the 2022 cycle for automated texting, used by Democrats like Joe Biden and Bernie Sanders.
  - Daisychain, a service designed for Democrats, reported $300,000 in spending for the 2026 cycle, a significant increase from $50,000 in 2024, with Michigan candidate Abdul El-Sayed's team accounting for over half of that.
  - Republicans utilized Campaign Nucleus, with the Republican National Committee and pro-Trump PACs investing six-figure sums.
  - In terms of generative media, while direct spending on tools like ElevenLabs ($1,400) and Midjourney ($1,600) was low, data shows at least 164 political ads utilized AI-generated media with a total ad spend of $80 million.

[2026-09-30] Record Spending and Shifting Senate Map in 2026 Midterms (interview)
Big Take — https://podtrac.com/pts/redirect.mp3/tracking.swap.fm/track/UVBrz8bN8aM2Xe47PEPu/traffic.omny.fm/d/clips/e73c998e-6e60-432f-8610-ae210140c5b1/825d4e29-b616-46f4-afd7-ae2b0013005c/e08555ea-559c-42e6-820d-b4d5014257a9/audio.mp3?utm_source=Podcast&in_playlist=8b1dd624-a026-43e9-8b57-ae2b00130066
  - In a September 30, 2026, episode of 'The Big Take', Bloomberg News hosts Sarah Holder, Bill Allison, and Bill Faries analyze the 2026 U.S. midterm elections, where Democrats need to pick up four Senate seats to secure a majority.
  - The discussion highlights a record-breaking campaign spending environment, with Republicans holding a significant financial advantage: approximately $700 million compared to the Democrats' $450 million in the Senate, while House spending is roughly even at $250 million each.
  - This Republican surplus is driven by Donald Trump’s super PAC, which raised over $400 million, the Senate Leadership Fund, party committees, and Elon Musk’s super PAC, which has contributed more than $20 million.
  - New corporate interests, including gambling, sports betting, and AI companies, are also entering the political arena.
  - A Supreme Court ruling in June 2026 removed limits on coordinated spending between national committees and campaigns, allowing the National Republican Senatorial Committee to outspend its Democratic counterpart on advertising by nearly 46 to 1 in August.
  - Despite the financial disparity, the article notes that Democrats are outperforming Republicans in small-dollar donations via the ActBlue platform, which raises three times as much as the Republican WinRed platform.
  - The conversation identifies the cost of living and the war with Iran—specifically rising gas and diesel prices—as key issues driving voter dissatisfaction in battleground states like Kansas, Iowa, and Ohio.
  - The episode concludes by speculating on the 2028 outlook, suggesting that while Democrats may have missed the window for 2026, they are likely to catch up in future cycles.

[2026-09-30] Brazilian 2026 Election Candidates Spend R$ 18.75 Million on Research
R7 Notícias — https://noticias.r7.com/eleicoes/2026/campanhas-de-candidatos-ja-gastaram-r-187-mi-com-pesquisas-eleitorais-30092026/
  - According to data from the R7 news organization, candidates in Brazil's 2026 elections have declared R$ 18.75 million in expenses for electoral research and tests, based on accounts submitted to the Electoral Justice.
  - The PL, PT, PP, and PSD parties account for over 60% of total spending.
  - Luiz Inácio Lula da Silva (PT), the incumbent president and candidate for re-election, spent over R$ 1.5 million on research, while his main opponent, Flávio Bolsonaro (PL), spent approximately R$ 866,600.
  - Federal deputies collectively invested the most in research, with over R$ 6 million, despite the presidential candidate spending proportionally more.
  - The top spenders by position include Lula (R$ 1.5 million), Maria do Carmo Seffair (PL, Governor of Amazonas, R$ 873,500), Flávio Bolsonaro (R$ 866,600), Sergio Moro (PL, Governor of Paraná, R$ 705,600), and Cristina Graeml (PSD, Senator of Paraná, R$ 500,000).
  - The PL party leads with R$ 5.79 million (30.9% of declared spending), followed by PT (R$ 2.30 million), PP (R$ 2.02 million), and PSD (R$ 1.44 million).
  - Nationally, spending is led by the presidential race (R$ 2.40 million), while among states, Paraná leads with R$ 1.91 million, followed by Paraíba (R$ 1.42 million) and Rio Grande do Sul (R$ 1.36 million).
  - The average cost per research contract is R$ 80,840, with half of the contracts costing at least R$ 35,550.

[2026-09-29] Senate Map Shifts to 13 Toss-Ups as 35 Days Remain in 2026 Midterms (interview)
The Sean Spicer Show — https://www.podtrac.com/pts/redirect.mp3/pdst.fm/e/mgln.ai/e/101/clrtpod.com/m/pscrb.fm/rss/p/traffic.megaphone.fm/THFD8310646173.mp3
  - On September 29, 2026, host Sean Spicer and Democratic strategist Chuck Rocha discussed the 'Battleground 2026' Senate map on 'The Sean Spicer Show', noting there are 13 toss-up races with 35 days remaining before the midterm election.
  - According to the Cook Political Report, the Senate map has shifted significantly: South Carolina and Nebraska have moved to 'Likely Republican', while Georgia and Minnesota are 'Likely Democratic'.
  - Kansas has shifted to 'Lean Democratic' and North Carolina has moved from 'Toss-Up' to 'Lean Democratic'.
  - In the 'Likely Republican' column, South Carolina features a tight race between Darlene Graham and Lindsey Graham, though a Trafalgar poll shows Graham at 43-42 with third-party candidates siphoning 6% of the vote.
  - Nebraska's incumbent Pete Ricketts leads independent Dan Osborne, with Polymarket traders giving Ricketts a 74% chance of winning.
  - On the Democratic side, John Ossoff holds a significant lead in Georgia against Mike Collins, with Ossoff reportedly spending over $60 million compared to Collins's $2 million.
  - Minnesota's Peggy Flanagan is favored in an open seat against Michelle Tafoya.
  - In the 'Lean Democratic' category, North Carolina features former Governor Roy Cooper leading Republican Tom Tillis's replacement by an average of 8.2%, with Democrats holding a $20.7 million cash advantage over the Republicans' $75 million in outside spending.
  - The hosts identified nine critical toss-up states: Alaska, Iowa, Maine, Michigan, New Hampshire, Ohio, Texas, and others.
  - In Texas, Ken Paxton faces James Tallarico, with Rocha noting that Tallarico has built a relatable reputation over six months while Republican super PACs have spent nearly $175 million in the last three weeks.

[2026-08-20] Crypto, AI, and Betting Sectors Set Records in 2026 US Election Spending
Invezz - Turkish — https://invezz.com/tr/haber/2026/08/20/kripto-yapay-zeka-ve-bahis-sirketleri-abd-ara-secim-harcamalarinda-rekor-kirdi/
  - According to a Reuters report, new sectors including cryptocurrency, artificial intelligence (AI), and online betting companies are reshaping US political spending by pouring record amounts into the 2026 midterm elections.
  - Data compiled by Public Citizen shows that US companies spent $517 million on House and Senate races in the 15 months leading up to the end of the first quarter of 2026, a figure that already exceeds the $461 million spent by these specific sectors during the entire two-year period covering the 2024 elections.
  - This surge marks a shift in Washington's corporate influence, as these industries—historically small or non-existent in political spending—now use their growing financial power to support candidates, influence regulations, and oppose policies they view as harmful.
  - The spending increase coincides with intensified congressional scrutiny of crypto, AI, and online gambling.
  - AdImpact predicts the broader political advertising market will reach $11.6 billion in this cycle, surpassing the $11.2 billion spent in the 2023-2024 cycle.
  - Specific sector contributions include at least $294 million from crypto, tech, and online gaming combined between January 2025 and the first quarter of 2026.
  - The crypto sector has been particularly aggressive, utilizing super PACs like Fairshake, which raised $193 million and spent approximately $130 million to support candidates based on their stance on crypto rather than party affiliation.
  - Individual billionaires are also active: Elon Musk has spent over $90 million on the 2026 federal elections, while Sergey Brin spent over $106 million on issues including California's proposed wealth tax.
  - In the AI sector, groups linked to OpenAI and Anthropic spent over $23 million in June alone on Democratic candidates in New York, with AI-focused super PAC 'Leading the Future' raising $140 million.
  - Anthropic contributed at least $40 million through Public First Action.

[2026-08-20] Crypto, AI, and Betting Drive Record Corporate Spending in 2026 US Midterms
Invezz — https://invezz.com/it/notizie/2026/08/20/criptovalute-ia-e-scommesse-spingono-la-spesa-record-alle-midterm-usa/
  - According to a Reuters report, corporate spending in the US midterm elections has reached a record $517 million in the 15 months leading up to the end of the first quarter of 2026, surpassing the $461 million spent in the entire two-year period covering the 2024 elections, according to data compiled by Public Citizen.
  - This surge is driven by new sectors including cryptocurrency, artificial intelligence (AI), and online betting, challenging the traditional influence of Wall Street.
  - In the 2026 cycle, these emerging industries have contributed at least $294 million to corporate spending since January 2025.
  - The cryptocurrency sector, exemplified by the super PAC 'Fairshake' supported by Coinbase, Ripple, and Andreessen Horowitz, adopted a strategy of backing candidates based on their stance on crypto rather than party affiliation, with Fairshake holding $193 million at the start of 2026 and $130 million remaining.
  - The AI sector, represented by groups linked to OpenAI and Anthropic, spent over $23 million in June alone in New York and raised $140 million through the super PAC 'Leading the Future', which includes donations from OpenAI co-founder Greg Brockman.
  - Anthropic donated at least $40 million via the 'dark-money' organization Public First Action.
  - Online betting companies, including DraftKings, FanDuel, and Polymarket's parent company Blockratize Inc., contributed over $72 million, with Polymarket donating $1 million to the Republican super PAC Congressional Leadership Fund.
  - AdImpact estimates total political advertising spending for the midterm cycle could reach $11.6 billion, exceeding the $11.2 billion spent in the 2023-2024 cycle.
  - Meanwhile, billionaire Elon Musk spent over $90 million on federal elections in 2026, and Google co-founder Sergey Brin spent over $106 million in California.
  - Critics and campaign finance watchdogs warn that this concentration of wealth from a few sectors could skew political debate away from issues like healthcare and gas prices toward industry-specific regulations.

[2026-08-14] US Midterms 2026: Record-Breaking Spending War Exposes Financial Rules
中华网科技公司 — https://news.china.com/socialgd/10000169/20260814/49674712.html
  - With less than three months until the November 2026 US midterm elections, the Republican and Democratic parties are engaged in a costly 'spending war' that exposes the financial rules behind the campaigns.
  - According to CCTV News, the Senate Leadership Foundation, a super PAC linked to Republican Senate Majority Leader John Thune, has spent $6 million on TV and digital ads in the swing state of Michigan since December 12 to block Democratic candidate Abdul Sayed.
  - In total, the foundation has invested approximately $51 million in Michigan.
  - Meanwhile, Democratic candidate Sayed received about $7.5 million in ad support, while his primary opponent, establishment figure Stevens, received over $60 million, with the largest backer being a group closely tied to the American Israel Public Affairs Committee (AIPAC).
  - According to a June report by Ad Impact, total ad spending for the 2026 midterms is projected to reach $11.6 billion, surpassing the $11.2 billion spent in the 2024 presidential election and the $8.9 billion spent in the 2022 midterms.
  - The Senate Leadership Foundation has already invested $354 million nationwide, an unusually early move as such groups typically ramp up spending in September.
  - Spending is concentrated in competitive races for Senate and Governor seats in states including Ohio, Alaska, Iowa, Texas, and Maine.

[2026-08-13] US 2026 Midterms: Billions in 'Money Politics' Expose Interest Group Influence (analysis)
news.cri.cn — https://news.cri.cn/20260814/025b2f81-86b0-4172-b25a-e8c538f21d60.html
  - With less than three months until the November 2026 US midterm elections, the two major American political parties have launched an intense 'spending war'.
  - The Republican-aligned Super PAC 'Senate Leadership Fund', associated with Senate Majority Leader John Thune, has spent $6 million on TV and digital ads in Michigan since December 12 to block Democratic candidate Abdul Sayeed, bringing its total spending in the state to approximately $51 million.
  - Sayeed, who won the Democratic primary with a narrow margin, received about $7.5 million in ad support, while his primary opponent, establishment figure Stevens, received over $60 million, largely backed by a group closely linked to the American Israel Public Affairs Committee (AIPAC).
  - According to a June report by Ad Impact, total ad spending for the 2026 midterms is projected to reach $11.6 billion, surpassing the $11.2 billion spent in the 2024 presidential election and the $8.9 billion in 2022.
  - The Senate Leadership Fund has already deployed $354 million nationwide for the midterms, an unusually early move for a Super PAC typically active only from September.
  - Spending is concentrated in battleground states including Ohio, Alaska, Iowa, Texas, and Maine.
  - Commentary by Su Xiaohui characterizes this 'money politics' as an exchange of interests, where wealthy donors and interest groups (such as the NRA and the cryptocurrency industry) fund campaigns to influence legislation and policy, thereby exacerbating political polarization and undermining the representation of ordinary citizens' needs.

[2026-07-29] North Carolina 2026 Senate Race Spending Reaches $164.3 Million
Star Local — https://starlocalmedia.com/news/national/election-2026-cooper-v-whatley-expensive-even-if-short-of-historic-spend/article_fe627cb2-a4b8-5887-920e-d8bc9c5d0428.html
  - In North Carolina's 2026 U.S. Senate race, conservative estimates indicate total spending has reached $164.3 million, which is far short of the previously forecasted $500 million to $1 billion.
  - As of July 29, 2026, the Senate Leadership Fund reported spending $17 million from its $71 million spring pledge in support of Republican candidate Michael Whatley.
  - The race features Whatley running against Democrat Roy Cooper and Libertarian Shannon Bray.

[… older articles omitted]

## Prediction markets on this question (Polymarket)
- RELATED (different resolution, context only): "Will the Democratic Party control the Senate after the 2026 Midterm elections?" → Yes: 0.62, Volume: $3.2M — Senate control, not spending totals
- RELATED (different resolution, context only): "Will the Republican Party control the Senate after the 2026 Midterm elections?" → Yes: 0.38, Volume: $2.2M — Senate control, not spending totals

## Tool outputs

### resolution_source (SUCCESS)
RESOLUTION SOURCE (the page the question resolves on — treat as the status-quo anchor):
  Current state: The FEC spending-by-the-numbers page lists Senate candidate spending totals by election cycle (2024, 2022, 2020, etc.) but the fetched page shows no actual data rows or totals for 2026, only the navigation structure and methodology. The question background notes that as of mid-August 2026, $666,336,000 had been spent by Senate candidates, but this is not reflected in the fetched FEC page content itself.
  Last updated: unknown | already resolved: unclear | page matches criteria: True
  Note: The fetched FEC page is a dynamic data table that requires JavaScript/interaction to display actual spending figures; the static fetch only captured navigation and methodology text, not the 2026 total spending figure needed to resolve this question. The question itself will remain open until the 2026 election cycle concludes and FEC data is finalized, likely checked again by Dec 31, 2026 per the fine print.
  Fetched: https://www.fec.gov/data/spending-bythenumbers/ (HTTP 200)
  Fetched: https://ballotpedia.org/119th_United_States_Congress (HTTP 200)
  Fetched: https://www.senate.gov/pagelayout/general/one_item_and_teasers/file_not_found.htm (HTTP 200)

### web_search (SUCCESS)
Web search summary (20 results):
I found comprehensive FEC data for all three queries. Here's a detailed summary:

## 1. FEC Statistical Summary: 18-Month Campaign Activity of the 2023-2024 Election Cycle

**Source:** [FEC.gov](https://www.fec.gov/updates/statistical-summary-of-18-month-campaign-activity-of-the-2023-2024-election-cycle) — covers activity from **January 1, 2023 through June 30, 2024**

**Key facts:**
- 
Congressional candidates collected $2.5 billion and disbursed $1.8 billion, according to campaign finance reports filed with the Federal Election Commission that cover activity from January 1, 2023 through June 30, 2024.

- 
United States House and Senate candidates running in the 2024 election cycle reported raising a total of $2.5 billion and spending $1.8 billion between January 1, 2023 and June 30, 2024.

- **Senate-specific:** 
The 255 candidates running for Senate in 2023 and 2024 reported total receipts of $857.5 million, disbursements of $681.9 million, debts of $181.1 million and cash-on-hand of $305 million.

- **House-specific:** 
The 1,809 candidates running for the House of Representatives reported combined total receipts of $1.6 billion, disbursements of $1.2 billion, debts of $263.7 million and cash-on-hand of $806.9 million in the 18-month period.

- Combined totals: 
Candidates for the two chambers reported combined total debts of $445 million and combined total cash-on-hand of $1.1 billion as of June 30, 2024.


**Historical comparison table (18-month disbursements by cycle):** 
2024: 2,064 candidates, $2,463.3M receipts, $1,834.4M disbursements; 2022: 2,585 candidates, $2,422.8M receipts, $1,756.7M disbursements; 2020: 2,273 candidates, $1,908.3M receipts, $1,199.1M disbursements; 2018: 2,415 candidates, $1,699.2M receipts, $1,132.2M disbursements.


---

## 2. FEC Statistical Summary: 18-Month Campaign Activity of the 2021-2022 Election Cycle

**Source:** [FEC.gov](https://www.fec.gov/updates/statistical-summary-of-18-month-campaign-activity-of-the-2021-2022-election-cycle/) — covers activity from **January 1, 2021 through June 30, 2022** (published June 10, 2022)

**Key facts:**
- 
Congressional candidates collected $2.4 billion and disbursed $1.8 billion, political parties received $1.4 billion and spent $1.1 billion, and political action committees (PACs) raised $5.5 billion and spent $4.6 billion. United States House and Senate candidates running in the 2022 election cycle reported raising a total of $2.4 billion and spending $1.8 billion between January 1, 2021 and June 30, 2022.

- **Senate-specific:** 
The 331 candidates running for Senate in 2021 and 2022 reported total receipts of $943.1 million, disbursements of $710.6 million, debts of $129.2 million and cash-on-hand of $382.9 million.

- **Party transfers:** 
Democratic and Republican House candidate committees transferred $29.6 million and $30.8 million, respectively, from their campaign accounts to their national congressional party committees. Democratic Senate candidate committe

### web_search (SUCCESS)
Web search summary (18 results):
Here's a comprehensive summary of findings for both queries:

## Query 1: 2026 Senate Race Fundraising/Spending (Q1 & Q3 Data)

**Roll Call (October 16, 2025) — Q3 2025 Fundraising Report**

Maine Sen. Susan Collins, the most vulnerable Republican up for reelection, raised $1.9 million from July through September, closing the month with $6.7 million on hand.
 
In Georgia, Sen. Jon Ossoff, the chamber's most vulnerable Democrat, raised $12.1 million over the past three months and ended the quarter with $21.4 million in the bank.
 
In Texas, Republican Sen. John Cornyn reported raising $910,000 through his main committee plus about $2.4 million through joint fundraising, while primary opponent Ken Paxton raised $1.3 million.
 
Sherrod Brown's Ohio campaign reported total receipts of $7 million in his first six weeks, while Democrat Frederick Ode contributed $5 million to his own long-shot campaign.
 
In Michigan, Republican Mike Rogers reported a third-quarter haul of $2.2 million and had $2.7 million on hand — the most in the field.


**NOTUS & PBS NewsHour (~April/May 2026) — Q1 2026 Fundraising**

Texas Democrat James Talarico led with $27 million raised in Q1, Roy Cooper (NC) raised nearly $14 million, Mary Peltola (AK) raised almost $9 million, and Sherrod Brown (Ohio) raised $12.5 million.
 On the Republican side, 
Cornyn and Paxton raised $2.5 million combined in Texas, while Georgia Republicans Derek Dooley and Buddy Carter combined for about $1.1 million.
 
Michael Whatley raised $2.1 million in North Carolina, Jon Husted raised $2.9 million in Ohio, Susan Collins raised $3.1 million in Maine, and Democratic primary rivals Janet Mills ($2.6 million) and Graham Platner ($4 million) competed to challenge her.
 
Peggy Flanagan raised $1.3 million in Minnesota, while three Democratic Senate candidates in Michigan collectively raised $7.2 million in Q1.


**NBC News (~July 2026) — Later Quarter Update**

By mid-2026, Democrats Roy Cooper and James Talarico had more than $20 million banked, while Republicans Michael Whatley and Ken Paxton had $3.5 million and $1.7 million respectively.
 
Maine's Susan Collins ended a quarter with $11 million left to spend as Democrats scrambled to replace Graham Platner as their nominee.


**CNN (September 26, 2026) — Late-Cycle Spending**

The NRSC had already spent $7.9 million in coordinated spending in North Carolina and $3.6 million in Georgia through the end of August.


**Spending Projections (uspollingdata.com, ~April 2026)**

The 2026 Senate cycle is projected to be the most expensive in American history, with total spending exceeding $2 billion.
 
The Senate Leadership Fund raised ~$85M in 2025 for defensive investments in Maine and Wisconsin, while Senate Majority PAC outpaced it with ~$92M targeting Wisconsin, Georgia, and North Carolina offensively.


**Cumulative Totals (themidtermproject.org, campaign money tracker)**

The five most expensive 2026 Senate races by total raised were: Texas ($101.4M,

## Prediction markets on this question (Polymarket)
- RELATED (different resolution, context only): "Will the Democratic Party control the Senate after the 2026 Midterm elections?" → Yes: 0.62, Volume: $3.2M — Senate control, not spending totals
- RELATED (different resolution, context only): "Will the Republican Party control the Senate after the 2026 Midterm elections?" → Yes: 0.38, Volume: $2.2M — Senate control, not spending totals

You are an elite superforecaster. Produce a probability distribution over the answer to this Metaculus numeric question.

## Question
What will be the total spending by all Senate candidates in the 2026 US election cycle?

## Description / Resolution Criteria
## Description
The 2026 midterm elections are scheduled to be held on November 3, 2026. The US Senate has 100 seat seats. [As of early 2025](https://ballotpedia.org/119th_United_States_Congress), 53 are held by members of the Republican Party, 45 are held by Democrats, and 2 are held by independents who [caucus with](https://www.senate.gov/about/glossary.htm#C) the Democrats.

Senators are elected for 6-year terms, and elections are held every two years, such that in each election approximately 1/3 of the seats are up for contest. For 2026, [the 33 seats of "Class II" are scheduled for election](https://www.senate.gov/senators/Class_II.htm). As of early 2025, 20 are held by Republicans and 13 of those seats are held by Democrats. The 33 winners of the 2026 Senate elections will join 66 incumbent Senators and the winners of the concurrent House elections to form the 120th Congress.

The [financing of electoral campaigns](https://en.wikipedia.org/wiki/Campaign_finance_in_the_United_States) in the United States happens at the federal, state, and local levels by contributions from individuals, corporations, and political action committees. According to the [Federal Election Commission](https://www.fec.gov/data/spending-bythenumbers/) (FEC) the total amount spent has been:

| Year | Total spending by all Senate candidates running that year |   |
| ---- | --------------------------------------------------------- | - |
| 2024 | \$1,687,323,291                                           |   |
| 2022 | \$1,708,197,866                                           |   |
| 2020 | £2,007,613,859                                            |   |

As at mid-August 2026, a total of \$666,336,000 (\$393,934,664 Democratic, \$261,005,865 Republican, and \$11,395,471 Other) has been spent by Senate candidates.

`{"format": "metac_reveal_and_close_in_period", "info": {"post_id": 45220, "question_id": 45413}}`

## Resolution Criteria
This question will resolve to the total spending by all US Senate candidates running in 2026 according to the [Federal Election Commission](https://www.fec.gov/data/spending-bythenumbers/) (FEC).

## Fine Print
This question may wait until December 31, 2026, to ensure that all data is updated and included.

***
This question's information (resolution criteria, fine print, background info, etc) is synced with an [original identical question](https://www.metaculus.com/questions/45220) which opened on 2026-09-28 17:00:00. This question will resolve based on the resolution criteria and fine print of the linked original question. However, if this question would resolve differently than the original question, then this question will be annulled. Additionally, if the original question's resolution could have been known before this question opened, then this question will be annulled.

## Range
The question's displayed range is [1000000000, 3000000000] (units: $).
The LOWER bound is OPEN: outcomes below 1000000000 are possible and resolve as "below range".
The UPPER bound is OPEN: outcomes above 3000000000 are possible and resolve as "above range".
Where a bound is open, your percentiles MAY lie outside the displayed range — the range is where the question author expects most of the mass, not a constraint on the answer. Do not compress your distribution to fit inside it.

## Research tool outputs (raw; the resolution-source read is the status-quo anchor)
## Tool outputs

### resolution_source (SUCCESS)
RESOLUTION SOURCE (the page the question resolves on — treat as the status-quo anchor):
  Current state: The FEC spending-by-the-numbers page lists Senate candidate spending totals by election cycle (2024, 2022, 2020, etc.) but the fetched page shows no actual data rows or totals for 2026, only the navigation structure and methodology. The question background notes that as of mid-August 2026, $666,336,000 had been spent by Senate candidates, but this is not reflected in the fetched FEC page content itself.
  Last updated: unknown | already resolved: unclear | page matches criteria: True
  Note: The fetched FEC page is a dynamic data table that requires JavaScript/interaction to display actual spending figures; the static fetch only captured navigation and methodology text, not the 2026 total spending figure needed to resolve this question. The question itself will remain open until the 2026 election cycle concludes and FEC data is finalized, likely checked again by Dec 31, 2026 per the fine print.
  Fetched: https://www.fec.gov/data/spending-bythenumbers/ (HTTP 200)
  Fetched: https://ballotpedia.org/119th_United_States_Congress (HTTP 200)
  Fetched: https://www.senate.gov/pagelayout/general/one_item_and_teasers/file_not_found.htm (HTTP 200)

### web_search (SUCCESS)
Web search summary (20 results):
I found comprehensive FEC data for all three queries. Here's a detailed summary:

## 1. FEC Statistical Summary: 18-Month Campaign Activity of the 2023-2024 Election Cycle

**Source:** [FEC.gov](https://www.fec.gov/updates/statistical-summary-of-18-month-campaign-activity-of-the-2023-2024-election-cycle) — covers activity from **January 1, 2023 through June 30, 2024**

**Key facts:**
- 
Congressional candidates collected $2.5 billion and disbursed $1.8 billion, according to campaign finance reports filed with the Federal Election Commission that cover activity from January 1, 2023 through June 30, 2024.

- 
United States House and Senate candidates running in the 2024 election cycle reported raising a total of $2.5 billion and spending $1.8 billion between January 1, 2023 and June 30, 2024.

- **Senate-specific:** 
The 255 candidates running for Senate in 2023 and 2024 reported total receipts of $857.5 million, disbursements of $681.9 million, debts of $181.1 million and cash-on-hand of $305 million.

- **House-specific:** 
The 1,809 candidates running for the House of Representatives reported combined total receipts of $1.6 billion, disbursements of $1.2 billion, debts of $263.7 million and cash-on-hand of $806.9 million in the 18-month period.

- Combined totals: 
Candidates for the two chambers reported combined total debts of $445 million and combined total cash-on-hand of $1.1 billion as of June 30, 2024.


**Historical comparison table (18-month disbursements by cycle):** 
2024: 2,064 candidates, $2,463.3M receipts, $1,834.4M disbursements; 2022: 2,585 candidates, $2,422.8M receipts, $1,756.7M disbursements; 2020: 2,273 candidates, $1,908.3M receipts, $1,199.1M disbursements; 2018: 2,415 candidates, $1,699.2M receipts, $1,132.2M disbursements.


---

## 2. FEC Statistical Summary: 18-Month Campaign Activity of the 2021-2022 Election Cycle

**Source:** [FEC.gov](https://www.fec.gov/updates/statistical-summary-of-18-month-campaign-activity-of-the-2021-2022-election-cycle/) — covers activity from **January 1, 2021 through June 30, 2022** (published June 10, 2022)

**Key facts:**
- 
Congressional candidates collected $2.4 billion and disbursed $1.8 billion, political parties received $1.4 billion and spent $1.1 billion, and political action committees (PACs) raised $5.5 billion and spent $4.6 billion. United States House and Senate candidates running in the 2022 election cycle reported raising a total of $2.4 billion and spending $1.8 billion between January 1, 2021 and June 30, 2022.

- **Senate-specific:** 
The 331 candidates running for Senate in 2021 and 2022 reported total receipts of $943.1 million, disbursements of $710.6 million, debts of $129.2 million and cash-on-hand of $382.9 million.

- **Party transfers:** 
Democratic and Republican House candidate committees transferred $29.6 million and $30.8 million, respectively, from their campaign accounts to their national congressional party committees. Democratic Senate candidate committe

### web_search (SUCCESS)
Web search summary (18 results):
Here's a comprehensive summary of findings for both queries:

## Query 1: 2026 Senate Race Fundraising/Spending (Q1 & Q3 Data)

**Roll Call (October 16, 2025) — Q3 2025 Fundraising Report**

Maine Sen. Susan Collins, the most vulnerable Republican up for reelection, raised $1.9 million from July through September, closing the month with $6.7 million on hand.
 
In Georgia, Sen. Jon Ossoff, the chamber's most vulnerable Democrat, raised $12.1 million over the past three months and ended the quarter with $21.4 million in the bank.
 
In Texas, Republican Sen. John Cornyn reported raising $910,000 through his main committee plus about $2.4 million through joint fundraising, while primary opponent Ken Paxton raised $1.3 million.
 
Sherrod Brown's Ohio campaign reported total receipts of $7 million in his first six weeks, while Democrat Frederick Ode contributed $5 million to his own long-shot campaign.
 
In Michigan, Republican Mike Rogers reported a third-quarter haul of $2.2 million and had $2.7 million on hand — the most in the field.


**NOTUS & PBS NewsHour (~April/May 2026) — Q1 2026 Fundraising**

Texas Democrat James Talarico led with $27 million raised in Q1, Roy Cooper (NC) raised nearly $14 million, Mary Peltola (AK) raised almost $9 million, and Sherrod Brown (Ohio) raised $12.5 million.
 On the Republican side, 
Cornyn and Paxton raised $2.5 million combined in Texas, while Georgia Republicans Derek Dooley and Buddy Carter combined for about $1.1 million.
 
Michael Whatley raised $2.1 million in North Carolina, Jon Husted raised $2.9 million in Ohio, Susan Collins raised $3.1 million in Maine, and Democratic primary rivals Janet Mills ($2.6 million) and Graham Platner ($4 million) competed to challenge her.
 
Peggy Flanagan raised $1.3 million in Minnesota, while three Democratic Senate candidates in Michigan collectively raised $7.2 million in Q1.


**NBC News (~July 2026) — Later Quarter Update**

By mid-2026, Democrats Roy Cooper and James Talarico had more than $20 million banked, while Republicans Michael Whatley and Ken Paxton had $3.5 million and $1.7 million respectively.
 
Maine's Susan Collins ended a quarter with $11 million left to spend as Democrats scrambled to replace Graham Platner as their nominee.


**CNN (September 26, 2026) — Late-Cycle Spending**

The NRSC had already spent $7.9 million in coordinated spending in North Carolina and $3.6 million in Georgia through the end of August.


**Spending Projections (uspollingdata.com, ~April 2026)**

The 2026 Senate cycle is projected to be the most expensive in American history, with total spending exceeding $2 billion.
 
The Senate Leadership Fund raised ~$85M in 2025 for defensive investments in Maine and Wisconsin, while Senate Majority PAC outpaced it with ~$92M targeting Wisconsin, Georgia, and North Carolina offensively.


**Cumulative Totals (themidtermproject.org, campaign money tracker)**

The five most expensive 2026 Senate races by total raised were: Texas ($101.4M,

## Prediction markets on this question (Polymarket)
- RELATED (different resolution, context only): "Will the Democratic Party control the Senate after the 2026 Midterm elections?" → Yes: 0.62, Volume: $3.2M — Senate control, not spending totals
- RELATED (different resolution, context only): "Will the Republican Party control the Senate after the 2026 Midterm elections?" → Yes: 0.38, Volume: $2.2M — Senate control, not spending totals

## Question dates and conventions
Dates: opened 2026-10-01; forecasting closes 2026-10-01; resolves 2026-12-02. Only events AFTER the open date can satisfy the criteria; assume the event has NOT happened unless a source shows it has. A question phrased 'before <date>' or 'by <date>' asks whether it happens between now and that date. The deadline for the outcome is the RESOLUTION date, not the close date.

## Recent news (AskNews, raw article summaries, newest first — read these directly)
13 AskNews articles (newest first; 6 from the last 48 h, 10 from the archive). Summaries are AskNews's own; dates are publication dates.

[2026-10-01] Brazilian Senate Candidates Receive Funding Exceeding Spending Caps
Valor Econômico — https://valor.globo.com/noticia/2026/10/01/candidatos-ao-senado-recebem-de-partidos-mais-do-que-podem-gastar.ghtml
  - According to a report by Valor Econômico using data from the Superior Electoral Court (TSE) updated as of September 25, 2026, half of the R$ 429.6 million in public funds transferred to Senate candidates is concentrated in just 50 of the 319 candidacies (15.7%).
  - While 39 of the 266 candidates who have submitted accounts so far received zero public funds, eight candidates received amounts equal to or exceeding the spending cap established by the TSE.
  - These eight candidates, described by the article as 'party bets' and 'repeated figures' in politics, include six who currently hold or previously held public office: five women (three from the PT) and three men.
  - Specifically, federal deputy Sílvia Cristina (PP) received R$ 3.5 million from the PP national directory, exceeding her R$ 3.17 million cap.
  - Former senator Rose de Freitas (MDB) received R$ 3.85 million, exceeding her R$ 3.81 million limit.
  - Former mayors Benedita da Silva (PT) and Marília Campos (PT), along with Senator Eliziane Gama (PT), received amounts exactly equal to their caps.
  - Experts explain that this is legal because expenses for lawyers and accountants are excluded from the cap, and funds can be used for 'shared spending' (dobradinhas) to support other candidates on the ticket.
  - The article notes that the PT prioritized female candidates, with Secretary Gleide Andrade stating they are 'political bets' for the election on Sunday, October 4, 2026.
  - In contrast, candidates like André do Prado (PL), Simone Tebet (PSB), Geraldo Rufino (Podemos), and Guilherme Derrite (PP) in São Paulo received high funding (over 80% of their caps) but did not exceed the limits.

[2026-09-30] 2026 Midterm Ad Spending Surges Past $1.5 Billion Driven by Key Senate Races
International Business Times News — https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071
  - Political advertising spending for the 2026 U.S. midterm elections has surpassed $1.5 billion, driven by a $317 million increase in just one week according to a Washington Post analysis of AdImpact data.
  - The Ohio Senate race between Republican Sen.
  - Jon Husted and Democrat Sherrod Brown leads all contests with approximately $240 million in spending, a 22% weekly increase.
  - Texas, the second-highest spending race, saw a 32% weekly jump, featuring a contest between Democrat James Talarico and Republican Ken Paxton.
  - At the national level, the Republican-aligned Senate Leadership Fund is the largest advertiser, having spent $145 million across competitive races, including $31 million in the past week.
  - The article notes that AdImpact projects total 2026 cycle spending could reach a record $11.6 billion, exceeding the $8.9 billion spent in 2022 and the $11.2 billion spent in the 2024 presidential election.
  - Outside groups, including President Donald Trump's political operation and Elon Musk's America PAC, are playing a prominent role, with Republican groups positioned to outspend Democrats by nearly $140 million in nine closely watched Senate races.

[2026-09-30] US Political Parties Spend Millions on AI Tools Amid Public Skepticism
Yahoo!奇摩股市 — https://tw.stock.yahoo.com/news/%E7%BE%8E%E5%9C%8B%E9%81%B8%E6%88%B0%E6%93%81%E6%8A%B1-ai-%E5%B7%A5%E5%85%B7-%E5%85%A9%E9%BB%A8%E7%AB%B6%E7%B8%BD%E8%A8%88%E6%8A%95%E5%85%A5%E5%8D%83%E8%90%AC%E7%BE%8E%E5%85%83-071913082.html
  - According to data from the US Federal Election Commission (US FEC) cited by The Guardian, 523 federal candidates and campaigns have spent at least $17 million on AI technology vendors since 2020.
  - Despite this investment, a September 2025 Pew Research Center poll indicates that over 70% of the public would have a poorer impression of a candidate who uses AI to write speeches, leading many to avoid discussing AI applications publicly.
  - Specific spending patterns show distinct partisan preferences: OpenAI has been used by at least 80 campaigns since 2024 with total spending of approximately $50,000, where the Republican National Committee was the largest buyer at nearly $10,000.
  - Conversely, Anthropic's Claude model was adopted by at least 65 candidates or committees in 2026, with Democrats using it at a rate roughly double that of Republicans; Senator Tom Cotton's campaign was the largest user, spending over $4,000.
  - Elon Musk's xAI service was almost exclusively utilized by Republicans, including the 2024 campaign of Robert F.
  - Kennedy Jr., with total spending of approximately $5,000.
  - In the realm of specialized political services, AmplifAI received $4.7 million during the 2022 cycle for automated texting, used by Democrats like Joe Biden and Bernie Sanders.
  - Daisychain, a service designed for Democrats, reported $300,000 in spending for the 2026 cycle, a significant increase from $50,000 in 2024, with Michigan candidate Abdul El-Sayed's team accounting for over half of that.
  - Republicans utilized Campaign Nucleus, with the Republican National Committee and pro-Trump PACs investing six-figure sums.
  - In terms of generative media, while direct spending on tools like ElevenLabs ($1,400) and Midjourney ($1,600) was low, data shows at least 164 political ads utilized AI-generated media with a total ad spend of $80 million.

[2026-09-30] Record Spending and Shifting Senate Map in 2026 Midterms (interview)
Big Take — https://podtrac.com/pts/redirect.mp3/tracking.swap.fm/track/UVBrz8bN8aM2Xe47PEPu/traffic.omny.fm/d/clips/e73c998e-6e60-432f-8610-ae210140c5b1/825d4e29-b616-46f4-afd7-ae2b0013005c/e08555ea-559c-42e6-820d-b4d5014257a9/audio.mp3?utm_source=Podcast&in_playlist=8b1dd624-a026-43e9-8b57-ae2b00130066
  - In a September 30, 2026, episode of 'The Big Take', Bloomberg News hosts Sarah Holder, Bill Allison, and Bill Faries analyze the 2026 U.S. midterm elections, where Democrats need to pick up four Senate seats to secure a majority.
  - The discussion highlights a record-breaking campaign spending environment, with Republicans holding a significant financial advantage: approximately $700 million compared to the Democrats' $450 million in the Senate, while House spending is roughly even at $250 million each.
  - This Republican surplus is driven by Donald Trump’s super PAC, which raised over $400 million, the Senate Leadership Fund, party committees, and Elon Musk’s super PAC, which has contributed more than $20 million.
  - New corporate interests, including gambling, sports betting, and AI companies, are also entering the political arena.
  - A Supreme Court ruling in June 2026 removed limits on coordinated spending between national committees and campaigns, allowing the National Republican Senatorial Committee to outspend its Democratic counterpart on advertising by nearly 46 to 1 in August.
  - Despite the financial disparity, the article notes that Democrats are outperforming Republicans in small-dollar donations via the ActBlue platform, which raises three times as much as the Republican WinRed platform.
  - The conversation identifies the cost of living and the war with Iran—specifically rising gas and diesel prices—as key issues driving voter dissatisfaction in battleground states like Kansas, Iowa, and Ohio.
  - The episode concludes by speculating on the 2028 outlook, suggesting that while Democrats may have missed the window for 2026, they are likely to catch up in future cycles.

[2026-09-30] Brazilian 2026 Election Candidates Spend R$ 18.75 Million on Research
R7 Notícias — https://noticias.r7.com/eleicoes/2026/campanhas-de-candidatos-ja-gastaram-r-187-mi-com-pesquisas-eleitorais-30092026/
  - According to data from the R7 news organization, candidates in Brazil's 2026 elections have declared R$ 18.75 million in expenses for electoral research and tests, based on accounts submitted to the Electoral Justice.
  - The PL, PT, PP, and PSD parties account for over 60% of total spending.
  - Luiz Inácio Lula da Silva (PT), the incumbent president and candidate for re-election, spent over R$ 1.5 million on research, while his main opponent, Flávio Bolsonaro (PL), spent approximately R$ 866,600.
  - Federal deputies collectively invested the most in research, with over R$ 6 million, despite the presidential candidate spending proportionally more.
  - The top spenders by position include Lula (R$ 1.5 million), Maria do Carmo Seffair (PL, Governor of Amazonas, R$ 873,500), Flávio Bolsonaro (R$ 866,600), Sergio Moro (PL, Governor of Paraná, R$ 705,600), and Cristina Graeml (PSD, Senator of Paraná, R$ 500,000).
  - The PL party leads with R$ 5.79 million (30.9% of declared spending), followed by PT (R$ 2.30 million), PP (R$ 2.02 million), and PSD (R$ 1.44 million).
  - Nationally, spending is led by the presidential race (R$ 2.40 million), while among states, Paraná leads with R$ 1.91 million, followed by Paraíba (R$ 1.42 million) and Rio Grande do Sul (R$ 1.36 million).
  - The average cost per research contract is R$ 80,840, with half of the contracts costing at least R$ 35,550.

[2026-09-29] Senate Map Shifts to 13 Toss-Ups as 35 Days Remain in 2026 Midterms (interview)
The Sean Spicer Show — https://www.podtrac.com/pts/redirect.mp3/pdst.fm/e/mgln.ai/e/101/clrtpod.com/m/pscrb.fm/rss/p/traffic.megaphone.fm/THFD8310646173.mp3
  - On September 29, 2026, host Sean Spicer and Democratic strategist Chuck Rocha discussed the 'Battleground 2026' Senate map on 'The Sean Spicer Show', noting there are 13 toss-up races with 35 days remaining before the midterm election.
  - According to the Cook Political Report, the Senate map has shifted significantly: South Carolina and Nebraska have moved to 'Likely Republican', while Georgia and Minnesota are 'Likely Democratic'.
  - Kansas has shifted to 'Lean Democratic' and North Carolina has moved from 'Toss-Up' to 'Lean Democratic'.
  - In the 'Likely Republican' column, South Carolina features a tight race between Darlene Graham and Lindsey Graham, though a Trafalgar poll shows Graham at 43-42 with third-party candidates siphoning 6% of the vote.
  - Nebraska's incumbent Pete Ricketts leads independent Dan Osborne, with Polymarket traders giving Ricketts a 74% chance of winning.
  - On the Democratic side, John Ossoff holds a significant lead in Georgia against Mike Collins, with Ossoff reportedly spending over $60 million compared to Collins's $2 million.
  - Minnesota's Peggy Flanagan is favored in an open seat against Michelle Tafoya.
  - In the 'Lean Democratic' category, North Carolina features former Governor Roy Cooper leading Republican Tom Tillis's replacement by an average of 8.2%, with Democrats holding a $20.7 million cash advantage over the Republicans' $75 million in outside spending.
  - The hosts identified nine critical toss-up states: Alaska, Iowa, Maine, Michigan, New Hampshire, Ohio, Texas, and others.
  - In Texas, Ken Paxton faces James Tallarico, with Rocha noting that Tallarico has built a relatable reputation over six months while Republican super PACs have spent nearly $175 million in the last three weeks.

[2026-08-20] Crypto, AI, and Betting Sectors Set Records in 2026 US Election Spending
Invezz - Turkish — https://invezz.com/tr/haber/2026/08/20/kripto-yapay-zeka-ve-bahis-sirketleri-abd-ara-secim-harcamalarinda-rekor-kirdi/
  - According to a Reuters report, new sectors including cryptocurrency, artificial intelligence (AI), and online betting companies are reshaping US political spending by pouring record amounts into the 2026 midterm elections.
  - Data compiled by Public Citizen shows that US companies spent $517 million on House and Senate races in the 15 months leading up to the end of the first quarter of 2026, a figure that already exceeds the $461 million spent by these specific sectors during the entire two-year period covering the 2024 elections.
  - This surge marks a shift in Washington's corporate influence, as these industries—historically small or non-existent in political spending—now use their growing financial power to support candidates, influence regulations, and oppose policies they view as harmful.
  - The spending increase coincides with intensified congressional scrutiny of crypto, AI, and online gambling.
  - AdImpact predicts the broader political advertising market will reach $11.6 billion in this cycle, surpassing the $11.2 billion spent in the 2023-2024 cycle.
  - Specific sector contributions include at least $294 million from crypto, tech, and online gaming combined between January 2025 and the first quarter of 2026.
  - The crypto sector has been particularly aggressive, utilizing super PACs like Fairshake, which raised $193 million and spent approximately $130 million to support candidates based on their stance on crypto rather than party affiliation.
  - Individual billionaires are also active: Elon Musk has spent over $90 million on the 2026 federal elections, while Sergey Brin spent over $106 million on issues including California's proposed wealth tax.
  - In the AI sector, groups linked to OpenAI and Anthropic spent over $23 million in June alone on Democratic candidates in New York, with AI-focused super PAC 'Leading the Future' raising $140 million.
  - Anthropic contributed at least $40 million through Public First Action.

[2026-08-20] Crypto, AI, and Betting Drive Record Corporate Spending in 2026 US Midterms
Invezz — https://invezz.com/it/notizie/2026/08/20/criptovalute-ia-e-scommesse-spingono-la-spesa-record-alle-midterm-usa/
  - According to a Reuters report, corporate spending in the US midterm elections has reached a record $517 million in the 15 months leading up to the end of the first quarter of 2026, surpassing the $461 million spent in the entire two-year period covering the 2024 elections, according to data compiled by Public Citizen.
  - This surge is driven by new sectors including cryptocurrency, artificial intelligence (AI), and online betting, challenging the traditional influence of Wall Street.
  - In the 2026 cycle, these emerging industries have contributed at least $294 million to corporate spending since January 2025.
  - The cryptocurrency sector, exemplified by the super PAC 'Fairshake' supported by Coinbase, Ripple, and Andreessen Horowitz, adopted a strategy of backing candidates based on their stance on crypto rather than party affiliation, with Fairshake holding $193 million at the start of 2026 and $130 million remaining.
  - The AI sector, represented by groups linked to OpenAI and Anthropic, spent over $23 million in June alone in New York and raised $140 million through the super PAC 'Leading the Future', which includes donations from OpenAI co-founder Greg Brockman.
  - Anthropic donated at least $40 million via the 'dark-money' organization Public First Action.
  - Online betting companies, including DraftKings, FanDuel, and Polymarket's parent company Blockratize Inc., contributed over $72 million, with Polymarket donating $1 million to the Republican super PAC Congressional Leadership Fund.
  - AdImpact estimates total political advertising spending for the midterm cycle could reach $11.6 billion, exceeding the $11.2 billion spent in the 2023-2024 cycle.
  - Meanwhile, billionaire Elon Musk spent over $90 million on federal elections in 2026, and Google co-founder Sergey Brin spent over $106 million in California.
  - Critics and campaign finance watchdogs warn that this concentration of wealth from a few sectors could skew political debate away from issues like healthcare and gas prices toward industry-specific regulations.

[2026-08-14] US Midterms 2026: Record-Breaking Spending War Exposes Financial Rules
中华网科技公司 — https://news.china.com/socialgd/10000169/20260814/49674712.html
  - With less than three months until the November 2026 US midterm elections, the Republican and Democratic parties are engaged in a costly 'spending war' that exposes the financial rules behind the campaigns.
  - According to CCTV News, the Senate Leadership Foundation, a super PAC linked to Republican Senate Majority Leader John Thune, has spent $6 million on TV and digital ads in the swing state of Michigan since December 12 to block Democratic candidate Abdul Sayed.
  - In total, the foundation has invested approximately $51 million in Michigan.
  - Meanwhile, Democratic candidate Sayed received about $7.5 million in ad support, while his primary opponent, establishment figure Stevens, received over $60 million, with the largest backer being a group closely tied to the American Israel Public Affairs Committee (AIPAC).
  - According to a June report by Ad Impact, total ad spending for the 2026 midterms is projected to reach $11.6 billion, surpassing the $11.2 billion spent in the 2024 presidential election and the $8.9 billion spent in the 2022 midterms.
  - The Senate Leadership Foundation has already invested $354 million nationwide, an unusually early move as such groups typically ramp up spending in September.
  - Spending is concentrated in competitive races for Senate and Governor seats in states including Ohio, Alaska, Iowa, Texas, and Maine.

[2026-08-13] US 2026 Midterms: Billions in 'Money Politics' Expose Interest Group Influence (analysis)
news.cri.cn — https://news.cri.cn/20260814/025b2f81-86b0-4172-b25a-e8c538f21d60.html
  - With less than three months until the November 2026 US midterm elections, the two major American political parties have launched an intense 'spending war'.
  - The Republican-aligned Super PAC 'Senate Leadership Fund', associated with Senate Majority Leader John Thune, has spent $6 million on TV and digital ads in Michigan since December 12 to block Democratic candidate Abdul Sayeed, bringing its total spending in the state to approximately $51 million.
  - Sayeed, who won the Democratic primary with a narrow margin, received about $7.5 million in ad support, while his primary opponent, establishment figure Stevens, received over $60 million, largely backed by a group closely linked to the American Israel Public Affairs Committee (AIPAC).
  - According to a June report by Ad Impact, total ad spending for the 2026 midterms is projected to reach $11.6 billion, surpassing the $11.2 billion spent in the 2024 presidential election and the $8.9 billion in 2022.
  - The Senate Leadership Fund has already deployed $354 million nationwide for the midterms, an unusually early move for a Super PAC typically active only from September.
  - Spending is concentrated in battleground states including Ohio, Alaska, Iowa, Texas, and Maine.
  - Commentary by Su Xiaohui characterizes this 'money politics' as an exchange of interests, where wealthy donors and interest groups (such as the NRA and the cryptocurrency industry) fund campaigns to influence legislation and policy, thereby exacerbating political polarization and undermining the representation of ordinary citizens' needs.

[2026-07-29] North Carolina 2026 Senate Race Spending Reaches $164.3 Million
Star Local — https://starlocalmedia.com/news/national/election-2026-cooper-v-whatley-expensive-even-if-short-of-historic-spend/article_fe627cb2-a4b8-5887-920e-d8bc9c5d0428.html
  - In North Carolina's 2026 U.S. Senate race, conservative estimates indicate total spending has reached $164.3 million, which is far short of the previously forecasted $500 million to $1 billion.
  - As of July 29, 2026, the Senate Leadership Fund reported spending $17 million from its $71 million spring pledge in support of Republican candidate Michael Whatley.
  - The race features Whatley running against Democrat Roy Cooper and Libertarian Shannon Bray.

[… older articles omitted]

## Research reports (one per dimension: web search + page reads, dated, with sources)
### CURRENT STATE
**Primary-source FEC data (official "Spending: by the numbers" / Statistical Summary series):**

- [2026-04-09] FEC's most recent periodic Statistical Summary press release (15-Month Campaign Activity, covering Jan 1, 2025–Mar 31, 2026) reports: 
the 291 candidates running for Senate in 2025 and 2026 reported total receipts of $654 million, disbursements of $400.8 million, debts of $44.6 million and cash-on-hand of $382.7 million.
 — https://www.fec.gov/updates/statistical-summary-of-15-month-campaign-activity-of-the-2025-2026-election-cycle/

- [2025-09-29] One-year-earlier comparable FEC snapshot (6-Month summary, through June 30, 2025): 
The 117 candidates running for Senate in 2025 and 2026 reported total receipts of $169.4 million, disbursements of $68.4 million, debts of $18.2 million and cash-on-hand of $222.6 million.
 — https://www.fec.gov/updates/statistical-summary-of-six-month-campaign-activity-of-the-2025-2026-election-cycle

- [2026-04-09] FEC 12-month summary (through Dec 31, 2025) for context on trajectory: 
Congressional candidates collected approximately $1.5 billion and disbursed $851.9 million... according to campaign finance reports filed with the Federal Election Commission that cover activity from January 1, 2025 through December 31, 2025.
 — https://www.fec.gov/updates/statistical-summary-of-12-month-campaign-activity-of-the-2025-2026-election-cycle

- [2026-10-01 fetch] The FEC's live "Campaign finance statistics" data-table page still lists the 15-Month set (through 03/31/2026) as its newest fixed-period table as of this check, meaning the 18-month (through 06/30/2026) and 21-month (through 09/30/2026) statistical-summary press releases had not yet appeared via search; the FEC's rolling "Spending: by the numbers" tool (https://www.fec.gov/data/spending-bythenumbers/) updates continuously from each campaign's most recent filed report rather than on a fixed schedule — https://www.fec.gov/campaign-finance-data/campaign-finance-statistics/

- [per question background] A more current rolling-tool figure already cited in the question itself: as of mid-August 2026, total Senate candidate spending stood at $666,336,000 ($393.9M Democratic, $261.0M Republican, $11.4M Other) — https://www.fec.gov/data/spending-bythenumbers/

**Trajectory / pacing context (non-FEC-primary, for cross-check only):**
- [2026-09-30] Bloomberg's Big Take reports a rough mid-cycle split of about $700 million for Republican-side Senate spending versus $450 million Democratic Senate spending — but this figure blends candidate committees with party/outside-group spending, not the FEC candidate-only disbursement total — https://podtrac.com/pts/redirect.mp3/...
- [2026-09-30] IBT/AdImpact reporting that midterm *advertising* spend across House+Senate has topped $1.5 billion is a distinct, narrower ad-spend metric (not total candidate disbursements) and projects total 2026 cycle (all office) ad spend near $11.6 billion — https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071

**Historical full-cycle comparators already in the question:** 2024 final = $1,687,323,291; 2022 final = $1,708,197,866; 2020 final = $2,007,613,859.

BOTTOM LINE: The FEC's own cumulative disbursement figure for Senate candidates rose from ~$68M (mid-2025) to ~$401M (end of Q1 2026) to ~$666M (mid-August 2026) per the question's own source — a steep, accelerating trajectory typical of a midterm year, with the bulk of spending still to come in the final weeks before the Nov 3, 2026 election; full-cycle totals in 2020/2022/2024 all landed between $1.69B and $2.01B, suggesting 2026 is on a similar or higher path (reinforced by outside reporting of record overall midterm spending).

NOT FOUND: An FEC Statistical-Summary press release for the "18-Month" (through 06/30/2026) or "21-Month" (through 09/30/2026) period for the 2025-2026 cycle could not be located via search as of this research; the FEC's live data-table index still showed the 15-month table as newest. The exact current (October 2026) running total from the FEC "Spending: by the numbers" interactive page could not be fetched directly (page is JavaScript-rendered and not accessible via static fetch), so the most recent hard number available is the mid-August 2026 figure ($666,336,000) already quoted in the question's background.

### BASE RATE
Historical FEC data on Senate candidate disbursements show the following growth pattern between the ~Sept.30 and Dec.31 checkpoints (the closest FEC-reported snapshots bracketing this question's Oct.1→Dec.2 window) in the prior three Senate cycles:

- [2024-04-23] 2023-2024 cycle: through Sept. 30, 2024 (21-month mark), 
"The 261 candidates running for Senate in 2023 and 2024 reported total receipts of $1.2 billion, disbursements of $1.1 billion"
; through Dec. 31, 2024 (24-month mark), 
"The 266 candidates running for Senate in 2023 and 2024 reported total receipts and disbursements of $1.5 billion, debts of $208.4 million, and cash-on-hand of $90.6 million"
 — i.e., roughly $400M (≈35%) was added in the final quarter. https://www.fec.gov/updates/statistical-summary-of-24-month-campaign-activity-of-the-2023-2024-election-cycle/
- [2022-09-07] 2021-2022 cycle: through Sept. 30, 2022, 
"The 345 candidates running for Senate in 2021 and 2022 reported total receipts of $1.3 billion, disbursements of $1.1 billion, debts of $151.5 million and cash-on-hand of $286.3 million"
; through Dec. 31, 2022, 
"The 342 candidates running for Senate in 2021 and 2022 reported total receipts and disbursements of $1.7 billion, debts of $163.4 million and cash-on-hand of $138.1 million"
 — roughly $600M (≈55%) was added in Q4. https://www.fec.gov/updates/statistical-summary-of-24-month-campaign-activity-of-the-2021-2022-election-cycle/
- [2020-09-18] 2019-2020 cycle: through Sept. 30, 2020, 
"The 284 candidates running for Senate in 2019 and 2020 reported total receipts of $1.3 billion, disbursements of more than $1 billion, debts of $48.1 million and cash-on-hand of $333.6 million"
; through Dec. 31, 2020, 
"The 289 candidates running for Senate in 2019 and 2020 reported total receipts and disbursements of $2 billion, debts of $21.6 million and cash-on-hand of $153.9 million"
 — close to $900M-$1B (≈90%+) was added in the final quarter, by far the largest Q4 surge of the three cycles (record 2020 spending surprised forecasters upward, partly due to a wave of late small-dollar/ActBlue donations and the Georgia runoffs). https://www.fec.gov/updates/statistical-summary-24-month-campaign-activity-2019-2020-election-cycle/
- [2026-09-30/10-01] Current cycle context: as of mid-August 2026 Senate candidate spending stood at $666.3M (per question background); AdImpact's independent ad-spending tracker (a different, larger universe including outside groups) has separately raised its full-cycle Senate advertising forecast from $2.8B to $3.4B, a 
"48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024"
, reflecting a late-cycle surge consistent with the historical pattern of back-loaded spending. https://www.cnbc.com/2026/06/11/2026-elections-ad-spend-adimpact.html
- [2026-09-30] IBT/Washington Post reporting notes 
political ad spending surged $317 million in just one week
-scale jumps recently, and total cycle ad spending (all offices) is now projected at a record $11.6B, up from $8.9B in 2022 and $11.2B in 2024, underscoring that late-breaking surges are a recurring and often underestimated feature of midterm cycles. https://www.ibtimes.com/midterm-ad-spending-blows-past-15-billion-these-are-senate-races-driving-surge-3808071
- [2025-xx] Prior-cycle forecast accuracy: AdImpact's own methodology note states 
"Last cycle, AdImpact's industry-leading projection of $10.7B came within 5% of the actual $11.2B, underscoring our position as the most trusted source for political advertising insights"
 for the all-office ad-spend total — suggesting reasonably good (within ~5%) forecast accuracy for total ad spend one cycle out, though candidate-committee FEC disbursement totals (a narrower, different metric than ad spend) have shown much larger swings between the Sept30→Dec31 window historically (35% in 2024, 55% in 2022, ~90%+ in 2020).

BOTTOM LINE: In every one of the past three Senate cycles, a substantial share of total Senate candidate disbursements (roughly 35–90%+ of the Sept.30 total) was added in the final quarter of the election year, with 2020 showing the largest and most surprising late surge; this historical pattern implies the final 2026 total will likely be meaningfully higher than the mid-August $666M figure and could exceed the 2024 record ($1.69B) given independent forecasters (AdImpact) are already projecting Senate-specific ad spend up 27-48% over 2022/2024.

NOT FOUND: An FEC "Spending: by the numbers" historical snapshot specifically dated Oct. 1 (vs. Sept 30/Dec 31 statistical summaries used as proxy) for 2020/2022/2024; a precise, non-rounded Senate-only disbursement figure for the Dec.31 marks in 2020/2022/2024 (FEC press releases rounded Senate receipts+disbursements together); and any explicit prior Metaculus/forecaster consensus number for the 2026 total Senate candidate spending question itself.

### KEY FACTORS
- [2026-06-30] The Supreme Court's 6-3 ruling in *NRSC v. FEC* struck down FECA limits on political-party coordinated expenditures (previously capped between $130,600 and roughly $4.1 million per Senate candidate), while leaving outside-group (super PAC) coordination rules untouched — https://www.fec.gov/updates/supreme-court-finds-limits-on-coordinated-party-expenditures-unconstitutional-in-nrsc-v-fec-609-us-____2026/

- [2026-09-24] In the two months following that ruling, 
the NRSC and NRCC poured a total of nearly $56 million of coordinated spending into Senate and House races across the country, while their Democratic counterparts spent around $6 million during this period
; critically, 
the NRSC spent about $11 million overall to support Jon Husted in Ohio, more than doubling the $4.9 million his own campaign committee had spent in the first 18 months of the race
 — this is a mechanism that could inflate the "race cost" narrative without necessarily inflating the FEC's candidate-committee-only disbursement total that this question resolves on, since NRSC coordinated spending is reported on the NRSC's own filings, not the candidate's Form 3. — https://www.detroitnews.com/story/news/politics/2026/09/24/republican-coordinated-campaign-spending-surges-after-us-supreme-court-ruling/91916812007

- [2026-09-24] Confirming this is a live, escalating dynamic rather than one-off: the NRSC made an "extraordinary late ask" for $8.9 million more (split $1.2M Alaska, $4.2M Iowa, $3.5M Ohio) specifically to fund further coordinated advertising buys in close races through Election Day — https://www.axios.com/2026/09/24/nrsc-republicans-alaska-iowa-ohio

- [2026-09-xx] The DSCC, by contrast, is leaning on record small-dollar fundraising rather than party-coordinated spending; its Q3 haul of $83.8 million was the best-ever quarterly total for any congressional party committee, with $43.7 million in September alone and over 80% from online grassroots donors — https://www.dscc.org/article/small-dollar-donors-help-dscc-smash-records-with-strongest-fundraising-month-biggest-q3-in-committee-history/

- [2026-09-28] USAFacts' FEC-sourced tracker (refreshed monthly) puts cumulative Senate candidate disbursements at 
around $1.9 billion for Senate and House candidates combined on races for the 2026 November midterm election as of August 2026, about 72.7% of campaign funds raised this cycle
, with the Senate-only slice at 
$622 million spent by Senate candidates on federal campaigns from January 2025–August 2026
 — a figure consistent with the question's own mid-August $666.3M snapshot (different cutoff dates) — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-09-28] Self-funding/high-spender concentration is a visible driver: 
James Talarico has spent the most money so far this election cycle at $47 million, and Senate candidates in Texas have spent the most on campaigns, with Georgia second at $60.8 million
, showing a handful of marquee races (TX, GA, OH, IL, ME, SC, FL) are driving a disproportionate share of total candidate spending. — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-09-30] A single death/succession event is also a minor but real factor: 
the top Republican spender, Lindsay Graham, passed away on July 11, 2026; his sister, Darline Graham Nordone, was appointed to fill his vacancy and has since launched her own Senate campaign in South Carolina for the 2026 midterm to serve a full six-year term
, adding an additional South Carolina candidate committee's spending into the final tally. — https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/

- [2026-10-01 fetch] The FEC's live "Spending: by the numbers" interactive page confirms the resolution mechanism precisely: the overall total is the sum of Form 3, Line 22, Column A disbursements from all candidates' authorized committees, and the chart is dynamic, updating continuously as each campaign's reports are filed — meaning the final published number will only firm up as post-election filings land. — https://www.fec.gov/data/spending-bythenumbers/

- [2026-10-01] A critical near-term catalyst controlled by filing deadlines, not campaign strategy: all Senate candidate committees must file their October Quarterly report (covering July 1–Sept 30) by October 15, 2026, and a Pre-General report (covering through Oct 14) is due October 22, 2026 — both landing before the question's Dec 2 resolution date and before the Nov 3 election, guaranteeing at least two more large tranches of verified spending data enter the FEC total ahead of resolution. — https://www.fec.gov/help-candidates-and-committees/dates-and-deadlines/2026-reporting-dates/2026-quarterly-filers/

- [2026-09-29] AdImpact's upward revision of Senate-specific ad-spend forecasts to $3.4 billion (from $2.8B) reflects "more races developed into expensive contests" — a leading indicator that late-entering competitive races (not just the original marquee list) are adding incremental dollars, which likely also shows up as additional late candidate-committee disbursements once their Oct 15 and Jan 31 reports post. — https://www.yournews.com (as cited in colleague research; see AdImpact figures)

BOTTOM LINE: The dominant mechanisms are (1) the FEC's own quarterly filing calendar — the Oct 15 and Oct 22 reports plus the post-election and year-end reports will mechanically add large, verifiable tranches to the running total before Dec 2 resolution — and (2) a post-*NRSC v. FEC* surge in party coordinated spending that inflates the overall "cost of the election" narrative but is booked on party (NRSC/DSCC) ledgers rather than candidate Form 3 filings, so it may not proportionally raise the specific candidate-only figure the question resolves on; a handful of marquee, high-burn races (TX, GA, OH, SC, IL, ME) and the DSCC's grassroots fundraising dominance are the controllable levers most likely to push the final candidate-disbursement total toward or above the historical $1.7–2.0B range.

NOT FOUND: No FEC "18-Month" or "21-Month" Statistical Summary press release (through June 30 or Sept 30, 2026) had yet been published via search as of Oct 1, 2026; no breakdown showing how much, if any, of the post-ruling NRSC/DSCC coordinated spending flows through candidate committees' own disbursement lines versus stays on party-committee books; no FEC data point newer than the mid-August $666.3M/USAFacts' Aug 2026 $622M snapshots was locatable (the live FEC tool is JS-rendered and not fetchable as static HTML).

### EXPERT VIEW
- [2026-06-11] AdImpact's initial 2026-cycle forecast: 
this year's races are projected to reach $11.6 billion in ad spend, eclipsing the $11.2 billion spent on ads for the 2024 election
, with 
the new projection a $795 million increase from a previous projection made last year
. (cnbc.com)

- [2026-06-11] Within that total, AdImpact's category breakdown at the time implied roughly $2.8 billion of ad spend on Senate races per subsequent reporting (see 2026-09-29 entry below for the updated figure); broadcast/cable/CTV/digital allocations were 
$5.6 billion to be spent on broadcast, $1.4 billion on cable, $2.6 billion on connected TV and $1.68 billion on digital
. (cnbc.com)

- [2026-09-13 reprint of original] AdImpact's sub-category estimate explicitly stated 
analysts project $3.4 billion will be spent on Senate campaigns, $2 billion will be spent on House races, $2.4 billion will be spent on gubernatorial elections
 — note this $3.4B figure already reflects an August revision (see next bullet). (insideaudiomarketing.com)

- [2026-09-29] AdImpact's most recent (late-September) revision raised its Senate-specific ad forecast: 
AdImpact raised its projection for Senate advertising from $2.8 billion to $3.4 billion as more races developed into expensive contests, representing a 48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024
. This figure is ad spending only (including outside groups/parties), not the narrower FEC "candidate disbursements" metric the question resolves on. (yournews.com)

- [2026-09-30] Bloomberg's "Big Take" podcast characterized the overall financial environment as record-breaking, reporting 
approximately $700 million compared to the Democrats' $450 million in the Senate
 spent by the parties' respective financial ecosystems as of late September — again a broader "spending environment" figure, not the FEC candidate-only total. (Bloomberg/podtrac)

- [2026-09-30] A Washington Post/AdImpact-based tally found 
the $1.5 billion already spent on congressional advertising represents only part of an expensive cycle, with AdImpact projecting total political advertising during 2026 could reach $11.6 billion, exceeding the $8.9 billion spent in 2022 and the $11.2 billion in 2024
. (ibtimes.com)

- [2026-09-28/mid-cycle] The FEC's own 15-month statistical summary (covering Jan 2025–Mar 2026) reported that 
the 291 candidates running for Senate in 2025 and 2026 reported total receipts of $654 million, disbursements of $400.8 million
 — this is the FEC's own trend data (not a forward "forecast") showing the pace of candidate-only spending roughly a year before Election Day.

- [2026-09-28] USAFacts, aggregating FEC data through August 2026, found 
candidates have spent a total of $622 million on 2026 Senate races
, consistent with the question's own stated mid-August FEC total of ~$666M for Senate candidates (slightly different cutoff dates explain the gap).

- [2026-09-28] By comparison, the FEC's own historical two-year cycle totals for Senate candidates were $1.69B (2022) and $1.69B (2024) per the question's background table, implying this cycle (at $622–666M through August, roughly 8-9 months before the close of the cycle and with the most expensive fall stretch still to come) is tracking toward a total plausibly in the same $1.7–2.2B range if historical spending curves (roughly 60-70% of full-cycle spend occurs in the final quarter before Election Day, per FEC 18-month/pre-election patterns in 2022 and 2024) hold.

- [2026-09-30] No market or analyst source found gives an explicit point forecast for the FEC's narrower "total spending by all Senate candidates" metric (the question's exact resolution variable); all available expert projections (AdImpact, OpenSecrets historically) forecast either total ad spend or total "cost of the election" including outside groups/PACs/parties, which are larger, overlapping but distinct figures from candidate-only FEC disbursements.

BOTTOM LINE: Expert trackers (AdImpact, Bloomberg, Washington Post) consistently project a record-breaking, roughly 30-48% increase in 2026 Senate-race money versus 2022/2024, but these projections (e.g., AdImpact's $3.4B Senate ad-spend figure, the $11.6B total cycle ad forecast) are built on all-spender (candidates + parties + outside groups) ad spending, not the FEC's candidate-only disbursement metric the question resolves on; scaling the proportional increase (~30-48%) onto the FEC's 2022/2024 candidate-only baseline of ~$1.69-1.71B suggests a plausible final FEC Senate-candidate total somewhere in the $2.0-2.4B range, though no source directly forecasts that specific FEC figure.

NOT FOUND: No explicit OpenSecrets or AdImpact point-forecast specifically for "FEC total disbursements by all Senate candidates" (the question's literal resolution variable) for full-cycle 2026; no Metaculus/prediction-market community median found for this specific question; no post-hoc accuracy assessment of past AdImpact or OpenSecrets forecasts against final FEC candidate-only totals.

### HIGH CASE
- [2026-09-29] USAFacts' FEC-sourced tracker (cut off at end of August 2026) found 
candidates have spent a total of $622 million on 2026 Senate races, with Texas campaigns spending the most of any state, $90.2 million, led by Democrat James Talarico at $47.0 million
, confirming individual-race spending is already concentrated at levels far above a typical non-competitive cycle. https://usafacts.org/answers/how-much-are-candidates-spending-for-the-midterm/country/united-states/
- [2026-09-13/09-29] AdImpact raised its full-cycle Senate ad-spend forecast again in late September, now projecting 
a $3.4 billion level, a 48% increase compared with Senate advertising during the 2022 election cycle and a 27% increase from 2024
 — a late-cycle upward revision (not a plateau), which historically has preceded FEC candidate-committee totals also beating prior cycles.
- [2026-09-18] AdImpact's real-time tracker puts the Ohio Husted–Brown race alone at 
$298 million in advertising spending so far, more than any other Senate race this cycle, and could become the costliest advertising battle of the 2026 midterms
, with candidate-side fundraising also surging: 
Brown has significantly outraised Husted, bringing in $38.6 million compared with the Republican's $14.3 million
 — evidence a single race's candidate committees could add well over $60M combined by Nov 3.
- [2026-08-26] Independent analysts see the 2026 cycle eclipsing 2024's Ohio record: 
AdImpact projects $749 million could be spent in Ohio this year... the 2024 Senate race between Brown and Moreno cost roughly $421 million overall, making it the most expensive nonpresidential race of that cycle
, implying this single state could nearly double its own prior-cycle record.
- [2026-06-30] A Supreme Court ruling (NRSC v. FEC) 
held that Federal Election Campaign Act limits on political party coordinated expenditures violate the First Amendment, overruling an earlier decision
; post-ruling filings already show a mechanism for additional money flowing through party committees toward candidates: 
the NRSC reported spending almost $46 million for candidates across the country... the DSCC spent just over $1 million after the ruling
, a channel that barely existed before and could still grow sharply in Q4 filings.
- [2026-09-29] Party-committee money available to push into candidate-adjacent spending remains unusually large on both sides this cycle: the DSCC reported 
outraising the NRSC by nearly $8 million in August and starting September with a more than $27 million cash on hand advantage... the DSCC also reported raising nearly $27 million in August... the committee's best monthly fundraising haul in history
 (though this reporting appears partly from a prior comparable cycle context, it illustrates the scale of committee war chests now being deployed).
- [2026-09-30 reaffirmed] USAFacts separately confirms the overall House+Senate candidate total already 
as of August 2026, Senate and House candidates have spent around $1.9 billion on races for the 2026 November midterm election... $622M spent by Senate candidates on federal campaigns from January 2025–August 2026
, and total receipts are even further ahead, giving candidates substantial additional cash-on-hand still to be spent before Nov. 3.
- [2026-10-15 upcoming] A concrete near-term data event that could push the resolvable number higher before the Dec. 2 resolution date: 
all authorized committees of House and Senate candidates must file a quarterly report by October 15, 2026, covering financial activity from July 1 through September 30
 — this filing will capture the heaviest fall spending surge (Sept.–Oct.) that in 2020, 2022 and 2024 accounted for 35-90%+ of full-cycle disbursements, and will be reflected in the FEC's rolling tool well before the Dec. 2 resolution.
- [2026-09-14 week] Outside-money intensity in competitive races remains extremely high and still climbing, with weekly IE totals such as 
SLF PAC reporting the most independent expenditure spending, $26,611,964 across 8 candidates, followed by Winsenate at $15,008,804
 in a single week — a pace that, if sustained through early November, point to a final-six-week surge consistent with the top of the historical range.

BOTTOM LINE: Every available indicator — the mid-August FEC candidate baseline ($622-666M), a record number of ultra-competitive, nine-figure individual races (Ohio, Texas, Georgia, Michigan, North Carolina), an unprecedented post-NRSC v. FEC coordinated-spending channel, and AdImpact's repeated upward revisions to Senate ad-spend forecasts (now $3.4B, +27-48% vs. 2022/2024) — points toward a high-scenario resolution meaningfully above the 2024 ($1.69B) and 2020 ($2.01B) records, plausibly in the $2.0-2.5B+ range if the typical 35-90% Q4 surge materializes and the Oct. 15 quarterly filings show comparable acceleration.

NOT FOUND: No single FEC or AdImpact figure directly forecasting the exact "candidate-committee-only" full-cycle total (the question's literal resolution metric); the FEC's October 15, 2026 quarterly reports and any subsequent "18-month"/"21-month" statistical summary press release were not yet published/searchable as of this research.

### LOW CASE
- [2026-10-01] FEC's own 2026 reporting calendar confirms the **Pre-General Report** (closing books Oct. 14) is due Oct. 22, and the **Post-General Report** (covering Oct. 15–Nov. 23, i.e., the final stretch of the campaign and the election itself) is not due until **Dec. 3, 2026 — one day after this question's Dec. 2 resolution date**. The Year-End report (covering through Dec. 31) is not due until Jan. 31, 2027. https://www.fec.gov/help-candidates-and-committees/dates-and-deadlines/2026-reporting-dates/pre-and-post-general-reports-2026/

- [2026-10-01] Because 
Pre-General Reports include all activity from the close of books on the committee's last report through 20 days before the election, while Post-General Reports include all activity from the close of books on the committee's last report through 20 days after the election
, any FEC pull taken on or before Dec. 2 will structurally exclude most Senate committees' reporting of their heaviest spending weeks (final two weeks of ads/GOTV plus election-day and immediate post-election disbursements) — a mechanical, deadline-driven reason the resolved total could land well below the eventual full-cycle figure.

- [2026-09-xx historical check] In the 2023-2024 cycle, the FEC's Dec. 31, 2024 statistical summary (24-month mark) reported combined Senate receipts/disbursements near $1.5 billion, yet the question's own table lists the eventual final 2024 total as $1,687,323,291 — meaning roughly $150-200M of additional spending was only captured by the FEC's rolling tool well after the Dec. 31 checkpoint, via late/amended filings. A Dec. 2 resolution this cycle (or even a Dec. 31 extension per the Fine Print) would likely miss a comparable late-arriving tranche.

- [2026-09-02] The FEC has operated without a commissioner quorum since closing its doors in October 2025, and Acting Chair Shana Broussard has flagged a record backlog of 307 stalled enforcement matters — while routine e-filing and raw data continue, this confirms the agency's "review of campaign finance disclosure reports" function has been degraded for the entirety of the run-up to the 2026 election, adding uncertainty about how complete/clean the rolling "Spending by the numbers" tool will be by early December. https://www.citizen.org/news/fec-shutdown-nears-one-year-mark-with-no-quorum-no-consequences/

- [2026-09-02] A new Continuing Resolution signed Sept. 2, 2026 funds the government (and thus FEC operations) through Dec. 11, 2026, meaning — unlike the Oct.–Nov. 2025 shutdown that closed FEC facilities and halted processing of newly filed paper reports — a funding-lapse-driven data freeze is not expected to disrupt FEC data processing during the critical Oct.–Dec. 2 window this cycle, somewhat limiting (but not eliminating, given the quorum issue above) one low-scenario risk. https://govtschemes.org/government-shutdown-2026-update/

- [2026-09-30] Structurally, the 2026 Senate map is unusually narrow: only a handful of races (Georgia, Maine, Michigan, North Carolina, and a few second-tier contests like Ohio, Iowa, Texas) are rated genuinely competitive, with Republicans defending roughly 22-23 of 35 seats, most in safe Trump-won states — a narrower competitive map than 2020 (which added Georgia's two runoff races, a major driver of that cycle's record total) or 2024, which could cap how high aggregate candidate disbursements climb even as ad-spend trackers rise. https://www.cbsnews.com/news/key-senate-races-2026/

- [2026-10-01] No Senate race in 2026 is positioned to trigger a runoff/overtime election analogous to Georgia's January 2021 runoffs, which were the single largest incremental driver pushing the 2020 cycle's FEC total toward $2.0 billion; absent such an add-on, the ceiling on the 2026 figure is mechanically lower than the 2020 comparator.

- [2026-09-xx] Independent tracker themidtermproject.org, aggregating FEC filings, shows Senate candidates have raised $753.0 million cycle-to-date (with a further $581.2 million in super PAC independent expenditures tracked separately) — a figure consistent with, but only modestly above, the question's mid-August $666.3M FEC snapshot, suggesting the pace of candidate-committee fundraising/spending growth in September was comparatively modest compared to the acceleration historically seen immediately before Election Day. https://themidtermproject.org/campaign-money-map

- [2026-10-01] The FEC's own 15-month summary (through Mar. 31, 2026) shows Senate candidate disbursements at $400.8 million versus $68.4 million at the 6-month mark (June 2025) — a slow early build that, combined with a narrower competitive map and the Dec. 2 reporting cutoff described above, supports a scenario where the resolved total sits noticeably below the $1.69-2.0B range seen in 2020-2024's eventual final tallies. https://www.fec.gov/updates/statistical-summary-of-15-month-campaign-activity-of-the-2025-2026-election-cycle/

BOTTOM LINE: The strongest, most concrete evidence for a low-end outcome is not weak fundraising but a reporting-calendar mismatch: the Post-General FEC report (due Dec. 3) falls one day after the question's Dec. 2 resolution date, and the Year-End report isn't due until Jan. 31, 2027, so whatever total is pulled by the resolution date will mechanically exclude most of the final two weeks of the campaign, election day, and immediate post-election spending — a gap that historically has been worth hundreds of millions of dollars (illustrated by the ~$150-200M added to the 2024 total after its Dec. 31 checkpoint) — compounded by a narrower, less competitive 2026 map and no Georgia-runoff-style overtime spending.

NOT FOUND: No official FEC 18-month or 21-month Statistical Summary press release for the 2025-2026 cycle (through June 30 or Sept. 30, 2026) could be located, nor any FEC quorum-restoration announcement; no explicit confirmation of whether the question's resolvers will invoke the Fine Print's Dec. 31 extension, and no primary-source figure for the FEC rolling tool's value as of early October 2026.

## Required pre-forecast walkthrough

Before giving percentiles, address these explicitly in your rationale:
  (0) Resolution check: what the resolution source currently shows, and whether the value is already known or fixed as of today.
  (a) The time left until the question resolves.
  (b) The outcome if NOTHING changes from today (the status quo value).
  (c) The outcome if the CURRENT TREND continues.
  (d) The expectations of experts / markets / base rates.
  (e) A plausible scenario that produces a LOW outcome (near p10).
  (f) A plausible scenario that produces a HIGH outcome (near p90).

## Calibration guidance

- **Be humble about tails.** Good forecasters set WIDE 90/10 intervals to account for unknown unknowns. Narrow tails get punished by the log score far more than slightly-biased medians.
- **Status quo anchoring.** The p50 should be close to the status quo value unless you have strong evidence of a trend.
- Don't pile mass at one value — if you're tempted, widen the spread by 20-50%.
- **Markets and experts are priors, not anchors.** If a SAME QUESTION market, analyst consensus, or community percentiles appear in the evidence, treat them as a strong prior — centre near them and widen — and name the specific evidence they lack whenever you move away. RELATED markets are context only.
- **Open bounds carry real mass.** Where a bound is OPEN, the outcome can land beyond it and the question then resolves "below range" / "above range". Put honest probability there (p_below_min / p_above_max in the output) instead of squeezing the distribution inside the displayed range; the season's worst losses were outcomes that landed where the distribution had ~2%.
- **Relative-return / spread questions ("how much will X's return exceed Y's").** A near-zero median is usually right, but size the TAILS to the more VOLATILE leg, not to a generic 2-3pp spread. Two broad equity indices (e.g. Nasdaq-100 vs S&P 500) do stay within roughly ±2-3pp over a two-week window. But when one leg is a commodity (crude oil, gold) or a single high-beta stock (e.g. Nvidia), the two-week realized spread regularly reaches ±10pp or more — crude-vs-equity spreads have hit ±18pp. In those cases set p10/p90 to at least ±10pp (±15pp or wider for oil) while keeping the median near the status-quo spread; the 2-3pp intuition applies only to index-vs-index.
- **Heavy-tailed one-off magnitudes (opening-weekend box office, product-launch or debut numbers).** Pre-event tracking for these routinely misses by ±40% or more, and results land both far above and far below the consensus. Do NOT treat the displayed [min, max] range as the plausible range or clamp p10/p90 to its edges: the outcome can fall outside the range in either direction (recent opening weekends resolved ~7% above a displayed ceiling in one case and roughly half the displayed floor in another). Set p10/p90 wide enough that a 2x-or-0.5x surprise versus your central estimate still lands inside the interval, and when concrete current tracking disagrees with historical/franchise base rates, weight the tracking.

## Output

Return ONLY valid JSON, no markdown fences:

{
  "rationale": "<address (a) through (f) above, then state your distribution — 6-10 sentences total>",
  "p10": <number>,
  "p25": <number>,
  "p50": <number>,
  "p75": <number>,
  "p90": <number>,
  "p_below_min": <probability in [0, 1] that the outcome is BELOW 1000000000>,
  "p_above_max": <probability in [0, 1] that the outcome is ABOVE 3000000000>
}

Percentiles MUST be in non-decreasing order (p10 <= p25 <= p50 <= p75 <= p90). p_below_min is P(outcome < 1000000000); p_above_max is P(outcome > 3000000000). These must agree with your percentiles: a p10 below the lower bound implies p_below_min > 0.10, a p90 above the upper bound implies p_above_max > 0.10. A mass below ~0.05 on an open side needs a specific reason.