Will Kansas US Senate have the largest margin of victory in the November 3, 2026 general elections for Kansas US Senate and Nebraska US Senate?

- [2026-10-02] Kansas: Decision Desk HQ forecast gives Roger Marshall (R) a 77% win probability with a projected margin of **R+8**, rating the race "Likely Republican." Roger Marshall is likely to win Kansas with 77% Probability, Adam Hamilton 23% Probability, Likely Republican, Generic Ballot D+7.9, Projected Margin R+8 (https://votes.decisiondeskhq.com/races/2026-11-03/kansas-us-senate-general-election) - [2026-10-02] Kansas: Latest poll (Trafalgar Group, Sept 29–Oct 1, LV) shows a near-tie: Hamilton 44.4%, Marshall 43.5%, i.e. Sep 29 – Oct 1, 1,095 LV, Hamilton +0.90% — far closer than DDHQ's fundamentals-driven R+8 forecast. (https://votes.decisiondeskhq.com/races/2026-11-03/kansas-us-senate-general-election) - [2026-10-02] Kalshi's own Kansas Senate winner market currently prices Marshall 68% / Hamilton 32% per aggregator snapshot. Kansas Senate winner? Hamilton32%. Marshall68% (https://kalshi.com/category/elections/midterms) - [2026-09-30] Nebraska: Pollsmax forecast gives Ricketts (R) an 84% win probability with a projected margin of **R+6.0** (53% R to 47% Osborn), rating the race "Likely Republican." The Pollsmax 2026 Nebraska Senate forecast currently gives Republican Pete Ricketts a 84% chance of defeating independent Dan Osborn, projecting Ricketts to receive 53% of the vote... a projected Republican margin of 6 percentage points. The model currently rates the race as Likely Republican. (https://www.pollsmax.com/senate/nebraska/forecast/) - [2026-10-02] Nebraska: Averaged poll aggregator (FiftyPlusOne) shows the race essentially tied, with Osborn slightly ahead: Oct 2, 2026 Osborn +1, Osborn 47.0%, Ricketts 46.2% (https://fiftyplusone.news/polls/senate/general/nebraska) - [2026-09-28] Nebraska: An internal GBAO poll (Osborn-aligned) found Dan Osborn (I) leading Pete Ricketts (R) in the U.S. Senate race, 47% to 46% (https://politicalwire.com/2026/09/28/nebraska-senate-race-remains-tight/) - [2026-09-14] Nebraska: SurveyUSA poll found Dan Osborn (I) leading Pete Ricketts (R) in the U.S. Senate race, 46% to 42% (https://politicalwire.com/2026/09/14/osborn-leads-ricketts-in-nebraska-senate-race/) - [2026-09-16] Nebraska: Wedgewood Polls (R-aligned) found the opposite, Pete Ricketts (R) leading Dan Osborn (I) in the U.S. Senate race, 52% to 48% — illustrating wide pollster-house-effect disagreement on the Nebraska margin. (https://politicalwire.com/2026/09/16/ricketts-leads-osborn-in-nebraska-senate-race/) - [2026-10-02] Cross-race forecast comparison (Poliwave) lists Nebraska as one of the very closest Senate races nationally: Closest first: Nebraska (R +0.6), Ohio (D +0.7), Texas (R +0.7), Iowa (R +0.9), Maine (D +2.2) with Kansas not among the closest, implying Kansas's expected margin is wider than Nebraska's per this model. (https://www.poliwave.com/us/fed/projection) - [2026-10-02] Decision Desk HQ's combined Senate forecast gives Nebraska 81% R win probability vs Kansas 77% R win probability, both rated "Likely R," State: Nebraska. Democratic Republican: 81%. Rating: Likely R. — Nebraska is modeled as modestly safer for the GOP in win-probability terms, which cuts against (not for) Kansas having the larger margin by this specific model, even though DDHQ's raw KS margin (R+8) exceeds the implied NE figure in some other trackers. - [2026-09-20] Kansas historical baseline: incumbent senator Roger Marshall was elected in 2020 with 53.2% of the vote, winning by 11.4% despite expectations of a close race , showing Kansas Senate races have recently outperformed pre-election polling for the Republican by a wide margin. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Kansas) - [2026-09-10] Nebraska historical baseline: in the Fischer-Osborn 2024 race, the margin was much tighter than fundamentals suggested, with Deb Fischer 53.19%, Dan Osborn 46.52% — a sub-7-point margin in a state Trump won by ~20, underscoring that Osborn consistently runs well ahead of the generic Republican lean, which could keep Nebraska's final margin narrower than Kansas's. BOTTOM LINE: Nearly all forecasting models (DDHQ, Pollsmax, Poliwave) currently project Kansas's margin (roughly R+8, with some live polls near a tie) as similar to or wider than Nebraska's (roughly R+5 to R+6, also with live polls near a tie), but both races are genuinely close and pollster-dependent, with Osborn's unusually strong track record against generic-Republican fundamentals being the key wildcard that could narrow Nebraska's margin below Kansas's. NOT FOUND: No official or near-final vote results exist yet (election is Nov 3, 2026); no single authoritative "projected margin" figure reconciling all models was found, and no post-October 2 Kansas poll beyond Trafalgar Group was located.

- [2026-10-02] Decision Desk HQ's 2026 forecast model gives Kansas a projected margin of Democratic Republican: 77%, Rating: Likely R with Marshall at 77% win probability and a headline "Projected Margin R+8" built from "Roger Marshall is likely to win Kansas" ... 77% Probability, Adam Hamilton 23% Probability ... Likely Republican, Generic Ballot D+7.9, Projected Margin R+8 (https://votes.decisiondeskhq.com/races/2026-11-03/kansas-us-senate-general-election). - [2026-10-02] The same DDHQ/Pollsmax-style model families rate Nebraska far closer: Decision Desk HQ lists Nebraska at only 81% Republican win probability (vs 77% in Kansas is inverted in raw numbers but margin-wise Nebraska's projected spread is much tighter), per State: Nebraska. Democratic Republican: 81%. Rating: Likely R (https://votes.decisiondeskhq.com/forecast/2026/senate). - [2026-10-02] Aggregator Poliwave's seat-by-seat projections explicitly rank Nebraska as the single closest Senate race in the country at "Toss-up +0.6" (Ricketts 50.3–Osborn 49.7), while Kansas is projected "Likely R +7.0" (Marshall 53.5–Hamilton 46.5), a gap of roughly 6.4 points in projected margin between the two races (https://www.poliwave.com/us/fed/projection). - [2026-10-03] Pollsmax's independent model similarly projects Nebraska at Republican Pete Ricketts a 84% chance of defeating independent Dan Osborn ... a projected Republican margin of 6 percentage points , still narrower than Kansas's ~7–8 point projected margin (https://www.pollsmax.com/senate/nebraska/forecast/). - [2026-10-01] Kalshi's own race-winner markets (not the margin contract) price Kansas Marshall at 68-70% and Nebraska Ricketts at ~73-74%, i.e., both incumbents favored to win, but neither market speaks directly to relative margin size (https://kalshi.com/markets/senateks/kansas-senate-race/senateks-26; https://kalshi.com/markets/senatene/nebraska-senate-race/senatene-26). - [2026-09-30] Multiple recent Nebraska polls show a true toss-up in raw ballot tests: a GBAO internal poll had Dan Osborn (I) leading Pete Ricketts (R) in the U.S. Senate race, 47% to 46% , and the FiftyPlusOne polling average put it at "Osborn 47.0%, Ricketts 46.2%" (https://politicalwire.com/2026/09/28/nebraska-senate-race-remains-tight/; https://fiftyplusone.news/polls/senate/general/nebraska). - [2026-10-02] Kansas polling, while also showing a tight horse-race (Trafalgar Oct 2: Hamilton+0.9; Wedgewood Sep 24: Hamilton+2; co/efficient Sep 11: Marshall+5), has a 270toWin 4-poll average of just Hamilton 45.8% / Marshall 46.0%, essentially tied — yet forecasters still project a wide final-margin gap because Kansas's partisan fundamentals (no Democratic Senate win since 1932) are judged to reassert themselves late (https://www.270towin.com/2026-senate-polls/kansas; https://votes.decisiondeskhq.com/races/2026-11-03/kansas-us-senate-general-election). - [2026-09-xx] Cook Political Report currently rates Nebraska "Solid Republican"/"Likely R" while historical context shows Osborn, running as an independent, finished surprisingly close to Republican Lisa Fischer in 2024, losing by just six percentage points in a state Donald Trump won by 20 , establishing a base-rate precedent of Nebraska Senate races running far closer than the state's partisan lean suggests (https://www.wonkette.com/p/wonkette-political-report-shifts). - [2026-xx] Historical base rate for Kansas: the last contested Kansas Senate race (2020) saw senator Roger Marshall was elected in 2020 with 53.2% of the vote, winning by 11.4% despite expectations of a close race , suggesting a pattern of Kansas Senate polls tightening pre-election but the eventual Republican margin exceeding pre-election polling margins, a template echoed in current fundamentals-heavy forecasts (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Kansas). - [2026-xx] Historical base rate for Nebraska: in the most recent prior cycle (2024 regular election), Fischer's final margin was 53.19% to 46.52% (a 6.67-point win) despite Trump's 20-point statewide margin, reinforcing that Nebraska's Senate margins have consistently run much tighter than Kansas's in comparable recent cycles. - [2026-10-01] A dedicated Polymarket "Nebraska Senate Margin of Victory" market currently has its largest buckets concentrated in the "Republican 3-6%" through "Republican 9-12%" ranges (13-17% each) alongside meaningful weight on "Independent" winning outright (0-3% and 3%+ combined ~29%), consistent with experts' and models' view of a race likely to finish within single digits, smaller than Kansas's projected ~7-8 point gap (https://polymarket.com/event/nebraska-senate-margin-of-victory-2026). BOTTOM LINE: Every cross-checked forecaster/model (DDHQ, Poliwave, Pollsmax, Cook, plus the Nebraska margin-of-victory market) and the historical track record of both states (Nebraska's Senate races running far closer than its partisan lean; Kansas's last two Senate races finishing in double digits) point toward Nebraska being the closer race and Kansas the wider one, favoring a "Yes" outcome, though both races still show tight horse-race polling that injects real uncertainty into the final margin comparison. NOT FOUND: An official, settled historical base rate specifically for "which of two concurrently-held correlated Senate races in neighboring red states had the larger margin" (no direct precedent dataset); confirmed, finalized 2026 general-election results (election has not yet occurred).

YES means: Kansas's 2026 US Senate general election finishes with a larger absolute vote-share gap between its top two finishers than Nebraska's 2026 US Senate general election does (per Source Agency results with ≥95% reporting or official certification). - [2026-10-02] A dedicated Polymarket contract titled "Closer Senate Race: Kansas or Nebraska?" (launched Sep 28, 2026) currently prices "Kansas" (i.e., Kansas being the closer of the two races) at only 53%, meaning traders see the two races as nearly coin-flip close to each other, but Kansas Senate contests both feature Republican incumbents facing notable challengers in solidly red states, with Marshall holding a narrow edge over Hamilton per recent Emerson polling, while Nebraska's Osborn draws some cross-party support but trails in aggregates projecting a clearer Republican margin — i.e., even this market's own framing leans toward Nebraska being modeled as having the clearer (larger) GOP margin, which would favor Nebraska, not Kansas, having the bigger gap; this cuts against a clean YES but shows the market itself is split roughly 50/50 on which state is closer, leaving real room for the "Kansas is NOT the closer race" (hence wider) interpretation. - [2026-09-16] An independent fundamentals-and-polling ensemble (Poliagg) put Kansas's predicted final margin at R+15.6 (80% CI R+5.4 to R+25.9) with Marshall given a 97% win probability, far wider than any Nebraska equivalent figure found, reflecting a model-driven view that polling average rates this race Lean R (R+2.8, sourced from polls), while the poliagg-v34 ensemble forecasts R+15.6 with an 80% CI ranging from R+25.9 to R+5.4, giving R a 97% chance of winning — i.e., fundamentals are expected to reassert strongly even though polls show a near-tie. - [2026-09-30] Pollsmax's Nebraska forecast, by contrast, projects a much narrower Republican margin of only R+6.0 (53%-47%), with its polling average on Sep 16 showing Pete Ricketts leading Dan Osborn by 2.8% in the Pollsmax polling average for the 2026 Nebraska Senate election, 48.8% to 46.0% — a materially smaller fundamentals-implied gap than Poliagg's Kansas R+15.6, supporting the YES path if fundamentals (not tied polls) drive the final count. - [2026-10-01] A Kalshi-tracking analysis (oddsshopper) notes Nebraska is "the rare Senate race where the polls and the prices tell opposite stories," with Kalshi and a five-model panel making Kalshi's market makes Pete Ricketts a clear favorite over independent Dan Osborn despite tied polling — indicating sophisticated market/model consensus still expects a solidly Republican (not razor-thin) Nebraska outcome, which, if realized at a "clear favorite" scale, could still leave Nebraska's margin narrower than Kansas's R+8-to-R+15 range projected by DDHQ/Poliagg. - [2026-10-01] Nebraska fundraising data show Ricketts with a decisive financial edge in the final stretch — Pete Ricketts 71% live odds, poll average 46.4%, funds raised $11.23M; Dan Osborn 29% live odds, poll average 46.7%, funds raised $5.75M — a nearly 2-to-1 money advantage that could fund a saturating ad blitz in the campaign's final month, a mechanism that historically helped Republicans outperform tied polling late (as seen in 2020 Kansas). - [2026-09-20/2020 precedent] Kansas's own history shows late-breaking Republican reversion from tied polling: Marshall's 2020 race was close in polling but Roger Marshall, for his part, won with an underwhelming margin in 2020, and is running as a Trump ally; the correct strategy in a state Trump carried by 16 points ultimately finished at R+11.4 — demonstrating a mechanism (late partisan reversion in a state unaccustomed to electing Democrats, Trump+16.2 in 2024 per RCP) that could again push Kansas's final margin into double digits even if October polling shows a toss-up. - [2026-09-23] Despite Cook's Sep 23 downgrade of Kansas to "Lean Republican," Cook's own explanation emphasizes transient, reversible shocks — agriculture is the driving force in the Kansas Senate race, specifically high fuel and fertilizer prices, as well as trade on beef, and these increased costs have made the race more competitive — and Cook simultaneously flagged that "Some private GOP polling has Marshall with more of an advantage than public polls and some private Democratic surveys that show a dead heat" , suggesting the public polling gap may overstate the race's true closeness, leaving room for a wider-than-polled final Kansas margin. - [2026-09-22] A separate Kansas combo-market analysis highlights an internal inconsistency traders are already pricing: Emerson College polling shows Democrat Adam Hamilton leading Republican incumbent Roger Marshall by two points in the Senate race, 45 to 43 percent, while Republican Ty Masterson leads Democrat Cindy Holscher by seven points in the governor's race, yet the prediction market prices a Republican sweep at 62.0% — implying traders broadly expect Marshall's final Senate result to outperform the Hamilton-led public poll, consistent with a wider eventual Marshall margin than current surveys show. - [2026-08-05] A historical Kansas-specific margin-of-victory market (Predictmarketcap/Kalshi archive) priced Republicans at 54% to win by 7+ points and 38% to win by 9+ points even before the recent tightening polls emerged, showing that double-digit or high-single-digit Kansas margins were already considered a live, non-trivial scenario independent of the Nebraska comparison. BOTTOM LINE: The strongest case for YES rests on the divergence between Kansas's polls (near-tied) and its fundamentals/historical pattern (Poliagg's R+15.6 projection, 2020's R+11.4 finish, Trump+16 lean), combined with Nebraska's heavier Ricketts financial advantage potentially producing a "clear favorite" result there too — if Kansas's fundamentals reassert late as they did in 2020 while Nebraska's result lands in the Pollsmax-projected R+6 range, Kansas's margin would exceed Nebraska's, resolving YES; but this path is not the consensus view, since the dedicated Kansas-vs-Nebraska closeness market is priced near 50/50. NOT FOUND: No official or near-final 2026 vote totals (election is Nov 3, 2026); no single reconciled "margin forecast" directly comparing the two races beyond the 53% Polymarket closeness contract; no post-October-2 polling for either state beyond what colleagues already found.

YES means: Kansas's 2026 Senate general election finishes with a larger first-vs-second-place vote-share gap than Nebraska's 2026 Senate general election. The NO case below argues the opposite — that Nebraska's margin could end up as wide or wider than Kansas's, or that the two margins could be too close/variable to be confident Kansas "wins" the comparison. - [2026-09-23] Cook Political Report's own Kansas race page shows the rating moving from "Likely R" to **"Lean R"** as of its Sept 23 update, i.e. Cook now treats Kansas as closer than a generic "likely" GOP hold, undercutting the case for a wide Kansas margin (https://www.cookpolitical.com/senate/race/488581). - [2026-10-02] A Hill report confirms this shift explicitly: "Cook Political Report and Sabato's Crystal Ball at the University of Virginia both shifted the race to 'Lean Republican' from 'Likely Republican' last week" , driven by Trump's drag on Marshall — a real-time narrowing signal not reflected in older "R+8" fundamentals forecasts (https://thehill.com/homenews/senate/6112686-pastor-challenges-incumbent-roger-marshall/). - [2026-09-08] The proximate cause of Kansas tightening is a New York Times investigation; a report published in The New York Times on September 8 said Marshall had filed more than 700 lawsuits against patients with outstanding bills during his medical career, triggering sustained bad press through early October (https://www.newsweek.com/roger-marshall-chances-kansas-senate-race-raucous-debate-12436148). - [2026-10-02] The newest public poll (Global Strategy Group/DAGA) has Adam Hamilton (D) leading Roger Marshall (R) in the U.S. Senate race, 47% to 43%, with David Graham (L) at 5% — a Democratic lead, not just a close race, which if representative would make Kansas's eventual margin small or even negative for the "expected" R column, not larger than Nebraska's (https://politicalwire.com/2026/10/02/adam-hamilton-leads-in-kansas-senate-race/). - [2026-09-30] The Hill/Emerson poll (Sept 15-16) similarly found Hamilton ahead by 2 percentage points, with 45 percent support to Marshall's 43 percent , with 4 percent of respondents choosing Libertarian candidate David Graham — showing a consistent multi-poll pattern of a Hamilton edge, not a wide Marshall lead (https://thehill.com/homenews/campaign/6096719-hamilton-leads-marshall-kansas-senate-poll/). - [2026-10-02] RealClearPolling's own tracker rates Kansas a flat-out "RCP Rating: Toss Up" with Marshall's single tracked public poll only "Marshall ahead 49-44" — a 5-point margin far smaller than the double-digit 2020 result and roughly comparable to or smaller than Nebraska's polling gaps (https://www.realclearpolling.com/polls/senate/general/2026/kansas/marshall-vs-hamilton). - [2026-09-16] Forecast models themselves disagree wildly on Kansas's projected margin: PoliAgg's ensemble puts the point estimate at "R +15.6 · 80% CI R+25.9 → R+5.4" , while Poliwave (per the colleague report) puts Kansas near R+7 — a roughly 8-point spread between models on the same race, meaning no single reliable number exists to confirm Kansas exceeds Nebraska (https://poliagg.com/race/us-senate-2026-ks/). - [2026-09-23] Ballotpedia/Cook tracker data show Nebraska has been rated as strongly as **"Solid Republican"** by Cook and Inside Elections even as of late March, with DDHQ/The Hill marking it "Pending" "Cook Political Report: Solid Republican DDHQ and The Hill: Pending Inside Elections: Solid Republican Sabato's Crystal Ball: Likely Republican" — institutional raters still see Nebraska's fundamentals-implied floor as very safe for Ricketts, meaning if turnout reverts to fundamentals late, Nebraska's final margin could land wide, not necessarily narrower than Kansas's (https://ballotpedia.org/United_States_Senate_election_in_Nebraska,_2026). - [2025-xx] Ricketts's own electoral history shows a template for a potential landslide outcome if Osborn's coalition fails to turn out: Ricketts's Last General Election: 62.6% (the 2024 special election against a weak Democrat) demonstrates this seat can produce blowout margins under different turnout conditions, which is the opposite tail risk from the close-poll scenario the YES case assumes for Nebraska (https://www.cookpolitical.com/senate/race/488631). - [2026-09-16] Nebraska polling disagreement is just as wide as Kansas's: a Republican-aligned Wedgewood poll found Pete Ricketts (R) leading Dan Osborn (I) in the U.S. Senate race, 52% to 48% — a 4-point GOP lead — directly contradicting Democratic-aligned polls showing an Osborn lead, meaning Nebraska's "true" margin is just as contested as Kansas's and could resolve wider than Kansas if Republican-leaning pollsters are correct. - [2026-09-14] An August Impact Research internal poll underscored this volatility, noting "that as an improvement from February, when Ricketts held a single-point lead over Osborn, 48 percent to 47 percent" , and that "Elections forecasters also favor Republicans, with both the Cook Political Report and Sabato's Crystal Ball classifying the race as Likely Republican" as of that period — showing Nebraska forecasters have held a more stable "safe-ish" GOP view than Kansas's recently-downgraded rating (https://www.newsweek.com/republicans-chances-of-losing-to-dan-osborn-in-nebraska-senate-race-12370545). - [2026-xx] A structural/technical point: Kansas has a Libertarian on the ballot (David Graham, polling 4-5% per Emerson and GSG surveys above) while Nebraska's race is a cleaner two-way contest after the Democrat exited; since the Kalshi rule defines margin using "total votes cast as the denominator," a meaningful third-party vote share in Kansas mechanically caps how large Marshall's first-vs-second gap can grow even if his two-party vote share is strong, a drag that doesn't apply to Nebraska's margin calculation. - [2026-xx] Resolution-technicality risk: the rules specify that if margins are "identical," each tied option resolves at 1/n — meaning in the plausible scenario that both races independently settle into a mid-single-digit-point margin (as several live polls in both states currently suggest, per the colleague reports' ~1-point polling margins), a near-tie outcome would not cleanly favor Kansas and could produce a split or NO-leaning resolution rather than a clear Kansas win. BOTTOM LINE: The most recent (late-September/early-October) data — Cook's downgrade of Kansas to "Lean R," multiple new polls showing Hamilton ahead or tied, and the ongoing Marshall medical-debt scandal — directly undercuts the fundamentals-based "Kansas wins by more" thesis, while Nebraska's institutional ratings (Cook, Inside Elections, Sabato's) have remained comparatively more stable at "Solid/Likely R," leaving genuine uncertainty about which state's final margin will be larger. NOT FOUND: No general-election result data exist yet for either race; no single reconciled "best estimate" margin model was found that all major forecasters agree on; no post-October-2 Nebraska poll or any poll later than October 2 for Kansas was located.