Will exactly 0 Senate Democrats lose re-election in 2026?

- [2026-09-23] Cook Political Report moved Georgia (Sen. Jon Ossoff, D) from "Lean Democrat" to "Likely Democrat," while leaving every other Democratic-held Senate seat up in 2026 rated Solid/Safe Democrat; Cook's September 23 table shows 9 Solid D, 2 Likely D (Georgia, Minnesota-open), 0 Toss-up Democratic-held seats. (https://www.cookpolitical.com/ratings/senate-race-ratings) - [2026-09-23] The Cook Political Report's full state-by-state table (as compiled on Wikipedia) shows every Democratic incumbent seeking re-election — Hickenlooper (CO), Coons (DE), Ossoff (GA), Markey (MA), Booker (NJ), Luján (NM), Merkley (OR), Reed (RI), Warner (VA) — rated **Solid D** except Ossoff, who is **Likely D**; none are rated Toss-up or worse. Colorado | D+6 | John Hickenlooper | 53.50% D | Solid D Georgia | R+1 | Jon Ossoff | 50.62% D | Likely D (https://en.wikipedia.org/wiki/2026_United_States_Senate_elections) - [2026-09-23] Multiple forecasters (Cook, DDHQ, Economist, FiftyPlusOne, Fox, Inside Elections, RCP, Sabato, Silver Bulletin, Split Ticket) as compiled on Wikipedia agree no Democratic-incumbent seat is below "Likely D," with toss-ups confined to Republican-held or open seats (Alaska, Iowa, Maine, Ohio special, Texas, and the open Michigan and New Hampshire seats). Overall | | | | D/I - 46 R - 47 7 tossups — all seven tossups are GOP-held or open, not Democratic incumbents. (https://en.wikipedia.org/wiki/2026_United_States_Senate_elections) - [2026-09-30] Jon Ossoff (GA), the single most-watched Democratic incumbent, leads Republican Rep. Mike Collins 51%-41% in a YouGov poll of 3,447 registered voters conducted Sept. 15-18; According to a new YouGov poll conducted Sept. 15–18 among 3,447 registered Georgia voters, Ossoff leads Republican Rep. Mike Collins 51% to 41% in the 2026 Senate race, with 6% undecided . (https://www.fox5atlanta.com/news/new-2026-georgia-poll-ossoff-leads-senate-race-governor-race-tied) - [2026-09-23] Cook's lead analyst noted the overall shift was favorable to Democrats generally but specifically singled out the Ossoff race: "It is simply becoming clear that Rep. Mike Collins does not have the time or money — in addition to the type of profile — to make this race truly competitive," Taylor wrote. "The Peach State contest has simply moved further off the board for Republicans." (https://heartlandernews.com/cook-political-report-declares-u-s-senate-a-true-toss-up-as-contests-in-georgia-kansas-south-carolina-shift-toward-democrats/) - [2026-09-15] Chris Coons (DE) won his Democratic primary comfortably; NBC's live-results tracker shows Delaware Senate Democratic Primary Winner September 15, 2026 Full Results. Coons 78% , removing any intra-party threat. (https://www.nbcnews.com/politics/2026-primary-elections/national) - [2026-09-09] Jack Reed (RI) won renomination easily: Primary elections were held on September 9. Reed won the Democratic nomination with 76.8% vote against minimal opposition. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Rhode_Island) - [2026-06-02] Ben Ray Luján (NM) won his primary decisively: Primary elections were held on June 2. Luján won the Democratic nomination with 83.7% of the vote against minimal opposition. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_New_Mexico) - [2026-09-18] Jon Ossoff (GA) won his Democratic primary unopposed with 100% of the vote, confirming no intra-party loss risk: Democratic primary results | Party | Candidate | Votes | % | Democratic | Jon Ossoff (incumbent) | 1,042,331 | 100.0 (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Georgia) - [2025-2026, various] Four Democratic incumbents (Durbin-IL, Shaheen-NH, Smith-MN, Peters-MI) are retiring rather than seeking re-election; under the question's rules, retirements do not count as "losing re-election," so even if Republicans flip any of these open seats it would not break the "0 losses" condition. Dick Durbin | Democrat | Illinois | April 23, 2025; Jeanne Shaheen | Democrat | New Hampshire | March 12, 2025; Tina Smith | Democrat | Minnesota | Feb. 13, 2025; Gary Peters | Democrat | Michigan | Jan. 28, 2025 (https://ballotpedia.org/List_of_U.S._Congress_incumbents_who_are_not_running_for_re-election_in_2026) - [2026-09-02] The 2026 Senate map overall was described as favorable to Republicans but with momentum shifting toward Democrats; Wikipedia's synthesis notes The 2026 Senate map is considered favorable to Republicans, even though Democrats are defending 13 seats and Republicans 22. Most rating groups identify two Republican-held seats as highly competitive and three or four others as somewhat competitive. By contrast, Democrats must flip at least four seats to win a majority while defending two highly vulnerable seats and two others viewed as somewhat vulnerable — but by late September those "highly vulnerable" characterizations applied mainly to the open Michigan seat and Ossoff's race in Georgia, both now rated no worse than "Tossup"/"Likely D." (https://en.wikipedia.org/wiki/2026_United_States_Senate_elections) - [2026-09-01 to 2026-09-15] All contested 2026 Senate Democratic primaries held to date (Massachusetts Sept 1, New Hampshire Sept 8, Rhode Island Sept 9, Delaware Sept 15) have been won by the establishment/incumbent-aligned candidate where an incumbent ran, with no incumbent Democratic senator losing a primary this cycle so far. (https://www.nbcnews.com/politics/2026-primary-elections/national) BOTTOM LINE: As of early October 2026, no Democratic Senate incumbent running for re-election has lost a primary or appears genuinely imperiled in the general election; every Democratic-held seat with an incumbent on the ballot is rated Solid/Safe D by essentially all major forecasters except Jon Ossoff's Georgia seat, which was just upgraded to "Likely D" and shows the incumbent polling ahead by roughly 5-10 points. This points toward "0 Senate Democrats lose re-election" being the more likely resolution, with Ossoff's race the only one carrying meaningful residual risk. NOT FOUND: No evidence of any Democratic incumbent senator losing a primary, runoff, or general election to date in 2026; no evidence of any credible redistricting-forced intra-party Democratic Senate matchup (Senate seats are not subject to redistricting); could not find any late-breaking (last 7 days) poll specifically threatening a non-Georgia Democratic incumbent's seat.

- [2026-09-23] Cook Political Report's current Senate ratings show only 2 Democratic-held seats as "Toss Up" (Alaska-Sullivan is actually Republican; the 2 Dem toss-ups are Georgia-Ossoff races are now rated higher) — as of this snapshot, Toss Up (7) races include 2 Dem and 5 Rep seats: AK Sullivan, IA OPEN, ME Collins, MI OPEN, NH OPEN, OH Husted, TX OPEN , and Ossoff is rated "Likely Democrat," not Toss Up. https://www.cookpolitical.com/ratings/senate-race-ratings - [2026-09-23] Cook upgraded Georgia: Jon Ossoff (D) changed from "Lean Democrat" to "Likely Democrat" , reflecting reduced (not zero) Democratic incumbent vulnerability this cycle. https://www.axios.com/2026/09/23/midterms-senate-georgia-kansas-south-carolina-forecast - [2026-09-23] Cook analyst Jessica Taylor noted "the current range of possible outcomes we see is Democrats netting between one and five seats; they must net four to win back the Senate." This frames 2026 as Democrats generally gaining seats, not losing incumbents. https://yournews.com/2026/09/23/7204307/cook-report-u-s-senate-a-true-tossup/ - [2026-10-01] Ballotpedia's historical table of incumbents defeated (House+Senate combined, 1988–2024) shows loss rates ranging 2.3%–14.7% per cycle, with 2020: 6.09%, 2022: 5.58%, 2024: 4.46% — a low and fairly stable baseline, though this is a combined House/Senate figure, not Senate-only. https://ballotpedia.org/United_States_Congress_elections,_2026 - [2022-11-12 to 2022-12-06] The most relevant Senate-specific precedent: in 2022, all twenty-eight Senate incumbents who ran for re-election won. This was the first time since 1914 that no Senate incumbent who ran lost re-election. That cycle resolved this type of question "Yes" for both parties simultaneously (base-rate instance of a zero-loss outcome). https://ballotpedia.org/Election_results,_2022:_U.S._Senate - [2024-11] By contrast, in the most recent cycle (2024), the Democratic-specific reference class failed: Four incumbents — all Democrats — lost re-election in the general elections in 2024 (Brown, Casey, Tester, et al.), showing the "0 losses" outcome does not always hold even recently. https://ballotpedia.org/United_States_Congress_elections,_2026 - [2025-05-06] Early 2026 vulnerability lists already narrowed the field sharply: "Our initial list of the Senate's most vulnerable incumbents for the 2026 cycle is shorter than usual after three Democratic incumbents from competitive states announced that they wouldn't seek reelection next year... just three senators are running for another term in states rated as 'Battlegrounds'... Georgia Democrat Jon Ossoff, North Carolina Republican Thom Tillis and Maine Republican Susan Collins" — meaning Ossoff is essentially the lone at-risk Democratic incumbent (Tillis later retired, converting NC to an open seat). https://rollcall.com/2025/05/06/most-vulnerable-senators-2026-election/ - [2025-11-06] A later Roll Call update confirmed the shrinking Democratic exposure as three Democratic incumbents from competitive states — Michigan's Gary Peters, New Hampshire's Jeanne Shaheen and Minnesota's Tina Smith — as well as Republicans Thom Tillis of North Carolina and Joni Ernst of Iowa all announced their retirements, leaving behind competitive seats , removing those names from the "incumbent loses re-election" reference class entirely (retirements don't count as losses under this question's rules). https://rollcall.com/2025/11/06/most-vulnerable-senators-2026-elections/ - [2026-09-26] Prediction markets and forecasters treat Ossoff's own re-election bid (not the "0 Dem losses" composite) as highly likely to succeed: aggregator pages reported "Prediction markets show Jon Ossoff as a strong favorite. Win probabilities for Ossoff typically range from 82% to 92% in late August and early September 2026... Decision Desk HQ forecasts Ossoff to win with an 83% probability" . Since Ossoff is the only Democratic incumbent in a competitive race, his individual win probability is close to a proxy for the "0 losses" outcome. https://www.octagonai.co/markets/elections/senate/georgia-senate-winner/ - [2025-01-07] Early Roll Call analysis flagged other potential Dem exposure points (Peters-MI, Shaheen-NH, Warner-VA, Markey-MA primary) but none of these ultimately became incumbent general-election toss-ups: Peters and Shaheen retired (open seats, not "losses"), Warner is rated Solid D, and Markey faces only a primary challenge. https://rollcall.com/2025/01/07/senate-vulnerable-2026-midterm-electio/ - [2026-10-01] Cook's current map places 9 Solid Democrat, 2 Likely Democrat, and 1 Lean Democrat seats, with no Democratic incumbent rated worse than "Toss Up," and most Democratic toss-up/competitive exposure concentrated in open seats (MI, NH, MN) rather than sitting incumbents. https://www.cookpolitical.com/ratings/senate-race-ratings BOTTOM LINE: The historical base rate for "zero Senate incumbent losses" happened as recently as 2022, but zero-Democratic-losses specifically failed in 2024 (four Dem incumbents lost); this cycle's map is unusually favorable for the "Yes" outcome because retirements (Peters, Shaheen, Smith) removed most at-risk Democratic incumbents from the loss-eligible pool, leaving essentially only Ossoff as a genuinely contested Democratic incumbent, and he currently holds a solid polling/forecast lead. NOT FOUND: A direct historical count of cycles where "zero Democratic incumbents specifically" lost (only combined-party and 2022-specific all-incumbent data were available); current Kalshi/Polymarket pricing for this specific contract (excluded per instructions); any other Democratic incumbent besides Ossoff currently rated below "Likely Democrat" by Cook, Sabato, or Inside Elections.

YES means: No sitting Senate Democrat who actively seeks re-election in 2026 loses a primary, runoff, general election, retention election, or recall — i.e., every Democratic incumbent on the 2026 ballot wins renomination and the general election. - [2026-09-01] The one contested Democratic incumbent primary with real national stakes, Massachusetts, is now resolved: Sen. Ed Markey defeated Rep. Seth Moulton decisively, Markey defeated Rep. Seth Moulton in the Senate primary in Massachusetts, NBC News projects, in a victory for the party's progressive wing, after he stressed his progressive positions and touted endorsements from Sens. Bernie Sanders and Elizabeth Warren , with Markey winning roughly 65% of the vote — closing off the single strongest intra-party threat to any Democratic incumbent this cycle. - [2026-09-22] Sabato's Crystal Ball's latest rating changes moved races toward Democrats, not away: IA Open (Ernst, R) Leans Republican→Toss-up; Roger Marshall (R-KS) Likely Republican→Leans Republican; MI Open (Peters, D) Toss-up→Leans Democratic — no Democratic incumbent seat moved in the riskier direction. - [2026-09-22] Sabato's consensus forecast and prediction-market aggregation both show Democrats net-gaining seats, not losing them: the table lists The U.S. Senate has 53 Republicans and 47 Democrats... Democrats will need a net gain of four seats to retake control in 2027... Consensus Forecast | 48 46 2 | 0 | 47 | 5 — i.e., both the consensus and markets project Democrats ending with more seats than now, which is incompatible with any incumbent loss. - [2026-10-01 est.] Georgia's Ossoff — the only Democratic incumbent rated below "Solid/Safe" by any major handicapper — enters the stretch run with an overwhelming financial edge: Federal Election Commission data show his campaign raised nearly $98 million from 2021 through June 2026 and had $42.6 million in cash on hand as of June 30... Collins had raised about $7.4 million and had roughly $2.1 million in cash on hand at the same point , a roughly 20-to-1 cash advantage heading into the final month. - [2026-09-21/23] Ossoff's polling average across 20 surveys, compiled independently of the single YouGov poll already noted, shows a consistent mid-high single-digit lead that has widened, not narrowed: Jon Ossoff currently averages 49.0%, ranking first in this race, 6.7 points ahead of the nearest opponent... Latest poll: 55.4% (Sep 21 - 23) , with the most recent poll in the set his best result of the cycle. - [2026-09-23 article dated, poll Sept 10-12] A Republican-aligned pollster's own numbers concede the race is effectively decided: Collins, he said, has an "exceptionally narrow" path at this point... "He is trailing significantly in the polls; unless something incredibly scandalous happens with Senator Ossoff or President Trump's poll numbers flip, I don't see much of a path" — an admission from a source sympathetic to Republicans that the one marginal Democratic seat is not competitive. - [2026-09-09/09-15/06-02] The other Democratic incumbents facing any primary this cycle (Reed-RI, Coons-DE, Luján-NM) all won renomination by landslide margins (76.8%–83.7%, per colleagues' prior research), and the Wikipedia 2026 election summary confirms none of these nine running incumbents is rated below "Solid D" except Ossoff, who is "Likely D." - [2026-09-02] Even the toughest intra-party contest of the cycle (Markey-Moulton) was not close on fundamental resources despite a spending disadvantage for the incumbent: Moulton and his allies had a spending advantage in the race, spending $7.1 million on ads to Markey and his allies' $3.9 million, according to AdImpact. That makes Markey's win another victory for a progressive who faced an onslaught of well-funded attacks , suggesting Democratic incumbents are proving resilient to well-funded challenges generally. - [2026 cycle, retirements] Four Democratic incumbents (Durbin-IL, Shaheen-NH, Smith-MN, Peters-MI) retired rather than seek re-election (per colleagues' research); under the question's own rules these departures cannot count as "losses" even if Republicans win the open seats, mechanically shrinking the pool of Democrats who could trigger a "No" resolution to essentially the nine incumbents actually on the ballot, eight of whom are Solid D and one (Ossoff) Likely D with a growing lead. BOTTOM LINE: The single plausible path to a "No" resolution — Jon Ossoff in Georgia — has only strengthened for Democrats since the question opened: his primary fight never materialized (unopposed), his toughest-rated intra-party rival race (Markey) was won comfortably, his polling lead has widened to high-single/low-double digits across a 20-poll average, and his cash advantage over Collins is roughly 20-to-1. With all other Democratic incumbents rated Solid D and already past their primaries, the "exactly 0 Senate Democrats lose re-election" (YES) outcome rests on a single data-rich, currently favorable race rather than on multiple uncertain contests. NOT FOUND: No evidence of any new Democratic incumbent primary or redistricting-driven intra-party matchup emerging since late September 2026; no Q3 2026 FEC filing yet published for Ossoff/Collins (Q3 reports are due by Oct. 15, 2026) to confirm the cash gap at the most recent date.

YES means: no Senate Democrat who actively sought re-election in 2026 loses their primary, runoff, or general election — i.e., every Democratic incumbent on the 2026 ballot wins a new term (retirements, like Peters, Shaheen, and Smith, don't count against this). - [2026-10-02] Georgia requires an outright majority to win a U.S. Senate general election; if Jon Ossoff fails to clear 50% against Mike Collins on November 3, the race goes to a runoff on **December 1, 2026** — a date that falls before this market's December 31 close, so a runoff loss would still resolve the contract NO before expiry. Georgia has required a majority to win a U.S. Senate general election since the 1960s. If no candidate clears 50% on November 3, 2026, the top two finishers meet in a runoff on December 1, 2026. - [2026-10-02] This is not hypothetical: in Ossoff's own 2020 race he took only 47.95% in the first round (Perdue led with 49.73%) and had to survive a four-point-margin runoff to win by just 1.2 points, showing the exact scenario (sub-50% finish, tight runoff) that could still produce a Democratic incumbent loss this cycle. Democrat Jon Ossoff narrowly defeated incumbent Republican Senator David Perdue in the runoff election, despite Perdue receiving more votes in the first round... the top two finishers—Perdue (49.7%) and Ossoff (47.9%)—advanced to a runoff election. - [2026-09-25] The current Georgia polling average still shows Ossoff only hovering around the 50% line with a meaningful "Other" vote share, not comfortably above the majority threshold: the 270toWin average of four late-September polls has Ossoff* at 50.0%, Collins at 43.0% with roughly 6-8% going to undecided/other candidates in individual surveys (InsiderAdvantage 9/25 at 50-42-8, Trafalgar 9/14 at 49-43-8), a gap that, if third-party support solidifies on Election Day, could knock Ossoff below 50% and trigger the Dec. 1 runoff risk described above. - [2026-10-02] A minor-party/independent candidate is also on the Georgia ballot, which is precisely the dynamic that forced the 2020 runoff; any libertarian or independent siphoning even 3-5% could again deny either major candidate a majority. (Independent candidate filings not separately itemized in the sources above beyond the "Other" polling category.) - [2026-10-02] The most directly comparable recent cycle shows the "zero Democratic losses" outcome failing even in a cycle most didn't see coming: in 2024, four incumbents — all Democrats — lost their general elections (Brown, Casey, Tester, and others), demonstrating that late favorable polling and incumbency do not guarantee a clean sweep for the party defending seats. - [2026-10-02] Georgia's own history underscores how close these Ossoff-type races can break late: the December 2022 Warnock-Walker runoff and the January 2021 double runoff were each decided by roughly one to two points, meaning normal polling error (the current Ossoff lead is 5-10 points, smaller than some pre-election polls showed Warnock/Ossoff enjoying in past cycles before tightening) leaves a plausible path to a Republican upset or a second runoff that could still flip before Dec. 31. - [2026-10-02] Status-quo/inertia case for NO is comparatively weak: unlike 2022, when Georgia's January 2021 double runoff flipped the Senate to Democratic control via a 50-50 split after Democrats already held momentum, 2026 is a genuine midterm year under a Republican trifecta, which historically produces swings against the president's opposition party's vulnerable seats less often than against the president's own party — but Georgia (Trump won it in 2024) is the one Democratic-held seat sitting in hostile partisan terrain, making it the dimension's single highest-leverage risk to the "exactly 0" condition. - [2026-10-02] Beyond Georgia, every other Democratic incumbent (Hickenlooper, Coons, Markey, Booker, Luján, Merkley, Reed, Warner) has already won their primary and faces no toss-up rating, meaning the NO case is now a single-point-of-failure argument resting almost entirely on Ossoff's ability to clear 50% outright or win a potential December runoff — a narrower but still live risk given his 2020 history in the same state. BOTTOM LINE: The strongest NO case is not that any "Safe D" seat could flip, but that Georgia's majority-vote/runoff rule creates a mechanical path — a sub-50% Ossoff finish on Nov. 3 followed by a Dec. 1 runoff loss, mirroring his own 2020 experience — through which exactly one Democratic incumbent loss could still occur before the Dec. 31 close, even though current polling and ratings lean Democratic. NOT FOUND: No evidence of any specific Georgia third-party/independent candidate's current polling share by name; no polling from the final two weeks of September/October specifically modeling runoff probability for Ossoff vs. Collins; no confirmed primary-loss or disqualification event for any other Democratic Senate incumbent beyond what prior reports already covered.