Will the Democrats win the Maine Senate race in 2026?

- [2026-07-10] Graham Platner, who had won the Democratic primary over Gov. Janet Mills, withdrew from the race on July 10 following sexual assault accusations and other controversies (en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Maine). - [2026-07-25] Jackson was chosen to replace Platner via a nominating convention held on July 25. Troy Jackson is now the official Democratic nominee facing incumbent Susan Collins (en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Maine). - [2026-09-09] CNN/SSRS poll: Jackson 48%, Collins 45% (270towin.com/2026-senate-polls/maine). - [2026-09-24] New York Times/Siena poll found the five-term Republican incumbent ahead of Jackson for the first time, 49% to 46% (pressherald.com, 2026-09-24). - [2026-09-24] Same day, two other polls showed the opposite: UMass Lowell/YouGov had Jackson up by five points with the support of 48% of respondents, compared with 43% for Collins , and UNH gave Jackson 51% to Collins' 47% (uml.edu, 2026-09-24; 270towin.com). - [2026-10-01] AARP poll: Jackson leading against Collins 50 to 47 percent, with 3 percent undecided , though voters 50-plus favor the five-term Republican over the Democratic candidate 53 to 44 percent (aarp.org, 2026-10-01). - [2026-10-02] CBS News/YouGov poll (fielded Sept. 23–Oct. 1) found the race effectively tied, with Jackson 50%–Collins 50% per the raw toplines; CBS noted four in 10 Democrats and most independents wish someone else were the Democratic nominee, and Jackson also runs behind the Democrats' gubernatorial nominee Hannah Pingree (cbsnews.com, 2026-10-02). - [2026-10-03] Trafalgar Group poll: Jackson 46%, Collins 46%, a dead heat (270towin.com, poll dated 2026-10-03). - [2026-10-04] 270toWin's rolling average of the 6 most recent polls puts Jackson at 48.3% to Collins' 47.5%, essentially a toss-up (270towin.com/2026-senate-polls/maine). - [2026-10-04] Decision Desk HQ's forecast (blending 43% fundamentals, 32% polls, 25% markets) rates Maine a "Toss Up," giving Troy Jackson is narrowly favored to win Maine with Jackson at 51% probability to Collins' 49% (votes.decisiondeskhq.com, accessed 2026-10-04). - [2026-10-04] DDHQ's overall Senate forecast: Democrats have a 56% chance of winning the Senate with a projected 51 seats as of October 4, 2026 , with Maine listed among the Toss Up states (votes.decisiondeskhq.com/forecast/2026/senate). - [2026-10-05 implied, ongoing] No AP/Fox News/NBC race call has been made; the general election itself occurs on November 3, 2026, with ranked-choice voting in effect, meaning a winner may not be immediately apparent if no candidate secures a first-round majority (en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Maine). BOTTOM LINE: As of early October 2026 the Maine Senate race between Troy Jackson (D) and Susan Collins (R) is a genuine toss-up — polling in the final weeks has swung both directions (Siena had Collins +3, AARP/UNH/UMass Lowell had Jackson +3–5, Trafalgar/CBS show a tie) — and aggregate models (270toWin average, DDHQ) show Jackson with only a very slight edge (~1-2 points / 51% probability), with no race call yet from AP/Fox/NBC. NOT FOUND: No evidence of a race call by AP, Fox News, or NBC as of 2026-10-05; no post-October 3 polling located beyond Trafalgar's 10/03 release; current live odds for this specific Polymarket contract were not sought per instructions.

- [2026-10-05 current] Maine has not elected a Democrat to the U.S. Senate since 1988; Democrats have not won a Senate election in Maine since 1988 , meaning Collins (and her predecessor seat) have been held by non-Democrats for roughly four consecutive decades/five Collins terms — the relevant reference class is strongly Republican/incumbent-favoring. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Maine - [2020-11-03] The most directly comparable precedent (Collins vs. a strong Democratic challenger in a similarly "Democrats should win this" environment) saw the opposite of forecasts: While Gideon led Collins in nearly every public poll, Collins unexpectedly defeated Gideon by 8.6 points on election day. That cycle Maine also voted for Biden by 9 points, showing an 18-point gap between presidential and Senate results. https://en.wikipedia.org/wiki/2020_United_States_Senate_election_in_Maine - [2026 cycle history] First elected in 1996, Collins has won five consecutive Senate terms in a state that has grown increasingly Democratic at the presidential level, and in 2020 she won re-election by 8.6 points while Maine simultaneously voted for Biden by 9 points — an 18-point split-ticket performance. This "Collins outperforms the generic Republican" pattern is the core base-rate anomaly forecasters must weigh against. https://uspollingdata.com/senate-2026/maine/ - [2026-04-07] Nonpartisan handicappers have rated this race competitively but not as a clear Democratic lean: as of early April 2026, ...Race ratings: The Cook Political Report with Amy Walter: Toss-up; Decision Desk HQ and The Hill: Pending; Inside Elections with Nathan L. Gonzales: Tilt Republican; Larry J. Sabato's Crystal Ball: Toss-up — i.e., no major outlet had moved to "Lean/Likely Democratic" even amid a Democratic-leaning national environment. https://ballotpedia.org/United_States_Senate_election_in_Maine,_2026 - [2026-09-18 (DDHQ newsletter, ~2 weeks pre-fetch)] A direct comparison of model outputs: the race looked to be tilting toward Gideon heading into Election Day, yet Collins not only won but did so handily, defeating Gideon about 51%-42%; President Trump's approval is around 40% and the electoral environment is clearly Democratic-leaning, but Collins's electoral record suggests Jackson has his work cut out for him; both candidates currently have about a 1 in 2 shot of winning in DDHQ's forecast. This underscores forecasters' explicit uncertainty about whether 2020's base-rate pattern (polls underestimating Collins) will repeat. https://decisiondeskhq.substack.com/p/susan-collins-troy-jackson-maine-senate-polls-2026-midterms - [2026-08-24] Statistical/fundamentals-based modeling (Silver Bulletin) treated Maine as one of a handful of true tipping-point races rather than a lean-Democrat seat: Silver's model also suggests competitive contests in Maine, Michigan and Iowa could become tipping-point races if the fight for control of the Senate remains close in November. The Senate race in Maine has been given an 11 percent chance of deciding control of the chamber. https://www.newsweek.com/nate-silver-outlines-which-races-could-decide-control-of-senate-12364019 - [2026-09-29] Pollsmax's quantitative, fundamentals-blended forecast actually tilts toward Collins despite Democratic-leaning polling averages: the Pollsmax 2026 Maine Senate forecast currently gives Republican Susan Collins a 56.8% chance of defeating Democrat Troy Jackson, projecting Collins to receive 50.5% of the vote compared with 49.5% for Jackson, a projected Republican margin of 1 percentage point; the model currently rates the race as Tilt Republican. https://www.pollsmax.com/senate/maine/forecast/ - [2026-09 (DDHQ model, ~11 days pre-fetch)] By contrast, DDHQ's blended forecast (fundamentals + polls + markets) leans slightly Democratic: Decision Desk HQ's forecast for this race blends 43% fundamentals, 32% polls, and 25% markets , with Jackson shown at roughly 51% to Collins' 49% — illustrating that different reputable models disagree on direction despite using similar inputs. https://votes.decisiondeskhq.com/races/2026-11-03/maine-us-senate-general-election - [2026-09-30 (Hill article on NYT/Siena poll)] A separate aggregator's model as of late September gave Jackson a narrow statistical edge: Decision Desk HQ gave Jackson a 54 percent chance to win the race, which is crucial for Democrats' chances of retaking the upper chamber of Congress; the party needs to flip a net of four seats for a majority in the Senate. https://thehill.com/homenews/campaign/6108169-susan-collins-troy-jackson-maine-senate-race-nyt-siena-poll/ - [2026-09 polling average] Aggregated public polling since the Jackson nomination has oscillated near a toss-up, generally with a small Jackson lead of 1-4 points, e.g., Pollsmax's average showed Troy Jackson leads Susan Collins by 3.0% in the Pollsmax polling average for the 2026 Maine Senate election, 49.5% to 46.5%, and the latest Wedgewood poll (Oct 1) had Jackson leading 52% to 48%. https://www.pollsmax.com/senate/maine/ - [Historical margin trend] Collins' winning margins have been shrinking each successive term in a steadily bluer state: Collins (R, inc.) 51.0% defeated Gideon (D) 42.4% in 2020, a margin of R+8.6, down from R+36.7 in 2014 and R+22.6 in 2008 — consistent with a secular trend toward tighter Collins races even though she has not yet lost. BOTTOM LINE: The reference class strongly favors Republicans holding this seat historically (no Democratic Senate win in Maine since 1988, Collins beating polling expectations by ~9-18 points in her toughest prior race in 2020), but the long-run trend of shrinking Collins margins plus a genuinely hostile 2026 midterm environment has pushed every major forecaster and poll aggregator into true toss-up territory (model win probabilities for Jackson ranging roughly 44%-68% depending on methodology), so the base rate argues for meaningful uncertainty rather than a confident Democratic or Republican lean. NOT FOUND: A direct FiveThirtyEight-branded 2026 forecast (FiveThirtyEight's current ownership/status for 2026 was not found in results); precise current win-probability numbers from Cook Political Report or Sabato's Crystal Ball (only categorical "Toss-up" ratings were found, not numeric probabilities); historical base rate for "Democratic-leaning midterm year + Republican incumbent in blue state" races nationally (not specifically researched beyond Maine's own history).

YES means: Troy Jackson (D) is declared the winner of the 2026 Maine U.S. Senate race, with AP, Fox News, and NBC all calling the race for him (or, absent a joint call, official certification showing his victory), by November 4, 2026 trading close. - [2026-09-18] Decision Desk HQ's own analysis frames 2026 as the toughest electoral test of Collins's career, noting 2026 is arguably the sternest test of Collins's electoral mettle in her political career, with Trump's approval around 40% and the electoral environment clearly Democratic-leaning , and that Democrats' lead on the generic congressional ballot has broken through the 7-point threshold, leading the GOP about 48%-41% in DDHQ's average . - [2026-09-24] The Hill reported that, despite Siena showing Collins ahead, as of that Wednesday Decision Desk HQ gave Jackson a 54 percent chance to win the race, which is crucial for Democrats' chances of retaking the Senate — showing model-based aggregation (incorporating fundamentals/markets, not just one poll) still favored Jackson even after the Collins-friendly Siena result. - [2026-10-01] Press Herald's write-up of the AARP poll notes a separate poll tracker shows Democratic momentum: Jackson leads by 25 points among voters under 50 , a generational gap that, combined with Maine's Democratic-leaning turnout patterns in recent cycles, gives Jackson a path if youth/base turnout holds up. - [2026-10-01] The AARP poll itself, despite showing Collins strength among seniors, still had 61% of respondents disapproving of Trump's job performance... and 53% preferred Democrats on the generic congressional ballot, compared to 43% for Republicans , confirming a hostile national environment for Republicans that Jackson can exploit down the stretch. - [2026-10-01] Press Herald also cites an independent aggregator showing a Jackson edge: Jackson holds a roughly two point lead over Collins, according to polling averages from the election website FiftyPlusOne (implicit in fetched article), reinforcing that multiple, not just one, aggregators have Jackson ahead or tied. - [2026-09-29 approx.] RealClearPolitics' own poll average, as fetched, currently shows Jackson(D) 47.6% to Collins(R) 47.5% , i.e., Jackson nominally ahead by 0.1 points — meaning even a polling aggregator built on raw crosstabs (not model-blended) still nudges toward Jackson, not Collins. - [2026 cycle, pre-July候选人 switch snapshot via RCP] Before the Platner-to-Jackson swap, RCP's chart trendline (archived view) shows the Democratic nominee's support cresting as high as the "Jackson 59.5%... Collins 40.5%" range earlier in the cycle, illustrating that under favorable framing/conditions the Democratic brand in Maine can poll well ahead, a ceiling Jackson could approach again if Collins-fatigue grows closer to Election Day. - [2026-10 ongoing] Fundraising momentum for Jackson has been large relative to a late-starting campaign: his campaign announced it had raised over $600,000 in roughly 72 hours, surpassing $1 million since launching his Senate run on July 8 , and shortly after, Jackson's campaign announced a $2 million fundraising surge since securing the nomination — evidence of grassroots energy that could translate into late advertising and GOTV capacity even though he trails Collins in total cash. - [2026-09-24 CBS/YouGov companion reporting] Even polls that show Collins holding her own concede the structural Democratic tilt of the state: Maine's Senate race seems a bit insulated from the national political winds — which otherwise seem to favor the Democrats — at least enough to keep incumbent Republican Susan Collins in a tied race with Democrat Troy Jackson in a state that otherwise has a Democratic-leaning electorate , implying that if that insulation erodes even slightly in the final month (e.g., via a bad Collins news cycle or stronger Democratic turnout operation), the state's underlying lean reasserts itself in Jackson's favor. - [2026-10-04, from colleague-cited DDHQ forecast] DDHQ's blended model (fundamentals+polls+markets) still gives Jackson a 54 percent chance to win the race type figure, consistent across two separate fetches/dates in this research, i.e., not a one-off artifact of a single poll. BOTTOM LINE: The strongest YES case rests on the convergence of a historically hostile national environment for Republicans (high Trump disapproval, 7+ point generic-ballot Democratic edge), a raw RCP polling average and several individual polls (UMass Lowell, UNH, AARP, CBS tie) still placing Jackson at or slightly ahead of Collins, and model aggregators (DDHQ) that have repeatedly — even after Collins-favorable polls like Siena — kept Jackson at a narrow >50% win probability; the path to YES is simply a continuation of the current toss-up trend breaking marginally blue, consistent with Maine's underlying Democratic presidential lean reasserting itself late in the race. NOT FOUND: No post-October 3 polling beyond Trafalgar (10/03) was located; no evidence of any AP/Fox/NBC race call; no granular early-voting or absentee-ballot return data by party for Maine 2026 was found to confirm/deny a Democratic turnout edge.

YES means: Troy Jackson (D) is declared the winner of the 2026 Maine U.S. Senate general election by AP, Fox News and NBC jointly (or, failing that, by official state certification), with the election occurring Nov. 3, 2026 under ranked-choice voting if no candidate exceeds 50% on election night. This dimension argues the NO case (Collins/Republican retains the seat). - [2026-10-05] Maine's structural history is unbroken: Democrats have not won a Senate election in Maine since 1988 , and Collins has converted every close race into a win for 30 years, most dramatically in 2020 when Maine was the only state to elect a senator of a different party than the winner of its presidential contest — a precedent directly on point for 2026's blue-leaning environment. - [2026-09-18] Even sympathetic forecasters frame Jackson as the underdog against this record: DDHQ's own analysis states Collins's electoral record suggests that Jackson has his work cut out for him , despite a Democratic-leaning environment. - [2026-09-18] DDHQ's polling average (narrower than 270toWin's) shows Jackson's edge is thin and shrinking in their methodology: Jackson finds himself just narrowly ahead of Collins in Decision Desk HQ's Maine polling average, about 47%-45% — a 2-point gap, smaller than other trackers. - [2026-10-04/recent] The GOP money advantage remains massive and outcome-relevant: the Senate Leadership Fund, which is the main fundraising vehicle for Senate Republicans, has raised $175 million since the start of 2025 and has booked $29 million in ads for the race , on top of a separate pro-Collins PAC that reserved $23.8 million in advertising and entered the race with $11.5 million cash on hand as of the first quarter of 2026 . - [2026-10-02] A fresh potential scandal (ProPublica pay-to-play story) has not visibly dented Collins: Axios reports Democrats' own super PAC spent $3.4M attacking her on it, but it also suggests they don't think the allegations in the ProPublica story — which Collins vigorously disputes — have broken through with Maine voters , implying the story may not move numbers before Nov. 3. - [2026-10-04] Even Jackson-favoring models rate the race as uncertain, not a clear Democratic lean: DDHQ's forecast gives both candidates currently about a 1 in 2 shot of winning in Decision Desk HQ's Maine Senate forecast , essentially a coin flip rather than a Jackson lean. - [2026-09-29, prior-cycle context] A separate fundamentals-weighted model (Pollsmax) actively favors Collins, projecting a 56.8% win probability and a 1-point Collins margin, rating the race "Tilt Republican" — already cited in base-rate research but reinforcing that not all quantitative models lean Jackson. - [2026-08-26] Ranked-choice voting mechanics add a small but real failure mode for Jackson: If no candidate receives more than 50% of votes on Election Day, the race goes to ranked choice run-off, where last-place candidates would be eliminated first. Votes for those candidates are then redistributed to a voter's next choice. That's repeated until one candidate receives more than 50% of votes — six declared write-ins could keep either major candidate under 50% on election night, delaying and complicating a call and introducing redistribution uncertainty (historically favored Collins in 2020, when she won outright without needing a runoff). - [2026-09-26] Independent journalism (Maine Wire) summarizing the state of play as of late September found pollsters have moved the candidates several points in either direction, but no public survey has demonstrated a sustained advantage outside the margin of error... the basic polling picture has barely moved , i.e., no clear Jackson momentum has emerged despite monthslong attacks. - [2026-10-05] Collins retains institutional advantages a challenger must overcome: she is chairs the Senate Appropriations Committee — one of the most powerful perches in Congress , a seniority/incumbency asset Maine voters have rewarded for five straight terms. - [2026-08-25/08-26] The write-in field itself is explicitly non-threatening to Collins's base (it's longshot Democrats/independents, not a serious spoiler vote), per Press Herald/Maine Morning Star reporting, meaning the race truly reduces to Collins vs. Jackson head-to-head — the exact matchup type Collins has never lost. BOTTOM LINE: Every element of "status-quo inertia" favors NO: a 38-year unbroken Republican/Collins hold on this seat, a direct 2020 precedent where Collins outperformed an even larger polling deficit in a similarly blue-trending environment, a massive and committed GOP financial advantage, and multiple current models (DDHQ at ~50/50, Pollsmax tilting Collins) showing no durable Jackson lead — all of which argue the safer bet, absent a late within in the final month, is that Collins wins again and the market resolves NO. NOT FOUND: Any post-October 3 polling beyond Trafalgar; explicit AP/Fox/NBC race-call status (none yet, as expected pre-election); detailed early/absentee vote data for Maine 2026 that might signal turnout direction.