Recent polling after the June 9 primaries shows Democratic nominee Graham Platner holding a narrow lead over Republican incumbent Susan Collins in head-to-head matchups, with margins ranging from one to three points in surveys conducted through mid-June. This edge, combined with Maine's consistent support for Democratic presidential candidates, underpins the trader consensus favoring the Democrat at 64 percent implied probability. Collins, seeking a sixth term as the sole Republican senator from a state carried by Democrats in recent cycles, benefits from incumbency and established name recognition, yet faces a competitive path amid ranked-choice voting dynamics. The general election on November 3 remains months away, leaving room for shifts from campaign events or turnout patterns.
Eksperymentalne podsumowanie AI odwołujące się do danych Polymarket. To nie jest porada handlowa i nie ma wpływu na rozstrzyganie tego rynku. · ZaktualizowanoGraham Platner delays decision on Senate campaign amid pressure
Democrat dips to 48%1%
Platner continued to hold off on announcing whether he would end his campaign despite mounting calls to quit. The Democratic Party prepared for a possible replacement, with key figures publicly distancing themselves from Platner.
Graham Platner suspends Senate campaign amid controversy
Democrat jumps to 63%9%
Graham Platner announced he was suspending his Senate campaign after the sexual assault allegations led to loss of endorsements and internal party conflict. This event caused a significant market reaction, with the Democrat price dropping and the Republican price rising accordingly.
Maine Democratic leaders urge Platner to withdraw from Senate race
Democrat jumps to 53%5%
Following the allegations, nearly all Maine Democratic Party leaders publicly called for Platner to exit the race, increasing uncertainty about the Democratic nomination and weakening the party's position against Collins.
Democrats consider replacing Graham Platner amid scandal
Democrat rises to 49%1%
With Platner weighing his future after the sexual assault allegation, Maine Democrats began exploring replacement candidates including Troy Jackson and Shenna Bellows. The party faced a tight deadline to select a new nominee, adding uncertainty to the race.
Graham Platner states he is considering 'best path forward' after sexual assault allegation
Platner denied the sexual assault allegation but said he was taking time to reflect on his political future and the best path forward for his campaign, creating uncertainty about his continued candidacy and impacting the race dynamics.
Sexual assault allegations against Graham Platner cause Democratic endorsements to be withdrawn
Democrat plunges to 54%15%
Following sexual assault allegations against Platner, major Democratic figures and organizations rescinded their endorsements and urged him to drop out, severely damaging his campaign and causing a sharp drop in the Democrat market price.
Sexual assault allegation against Graham Platner emerges
Democrat drops to 48%7%
A new sexual assault allegation against Platner surfaced, causing a rapid collapse of Democratic support and endorsements. Prominent figures including Bernie Sanders and Elizabeth Warren called for Platner to withdraw, threatening Democratic chances in Maine and causing market volatility.
Democrats withdraw endorsements from Platner amid sexual assault allegations
Democrat drops to 54%8%
Following the sexual assault allegations, several Democratic officials rescinded their endorsements of Platner, increasing uncertainty about his candidacy and causing a drop in the Democrat's market probability.
New sexual assault allegation against Graham Platner surfaces during general election campaign
Democrat drops to 48%11%
Additional sexual assault allegations against Platner emerged in early July, intensifying controversies around the Democratic nominee and causing further volatility and a dip in market confidence for the Democrat.
Top Democrats rescind endorsements and call on Platner to end Maine Senate campaign
Following the sexual assault allegation, major Democratic figures and organizations, including the Maine Democratic Party and the Senate Democratic Campaign Committee, rescinded their endorsements of Platner and urged him to drop out to preserve the party's chances of winning the seat.
Fox News poll shows Collins leading Platner in Maine Senate race
Republican rises to 39%2%
A Fox News poll conducted June 23-27 showed Collins leading Platner 50% to 47%, reflecting a competitive race with a slight advantage for Collins. This poll contributed to a shift in market sentiment favoring the Republican candidate.
New York Times/Siena poll shows Platner narrowly leading Collins in Maine Senate race
A poll conducted June 19-26 showed Platner leading Collins 49% to 47% among likely voters, indicating a tight race with Platner holding a slight edge despite controversies. The poll highlighted Platner's lead among female voters and Collins' lead on character questions.
Poll shows Platner narrowly leading Collins in Maine Senate race
Democrat rises to 63%1%
A New York Times/Siena University poll found Platner leading Collins 49%-47% among likely voters, within the margin of error, indicating a statistical dead heat. Despite controversies, Platner maintained a slight lead, but Collins led on character questions.
Fox News poll shows Susan Collins leading Graham Platner in Maine Senate race
Republican jumps to 37%11%
A Fox News poll conducted June 23-27 showed Collins leading Platner 50% to 47%, indicating a competitive race but a slight advantage for the Republican incumbent. This poll likely contributed to a stabilization and slight decline in the Democrat's market price and a corresponding rise for the Republican.
Poll shows Platner with slight edge over Collins in tight Maine Senate race
Democrat drops to 23%5%
A New York Times poll found Platner slightly ahead of Collins, indicating a competitive race with fluctuating voter preferences. This contributed to market volatility between the Democratic and Republican outcomes.
Fox News poll shows Susan Collins narrowly leading Graham Platner
Republican jumps to 28%5%
A Fox News poll conducted June 23-27 showed Collins with a 3-point lead over Platner, reflecting a tightening race and concerns among voters about both candidates. This poll caused market shifts favoring the Republican candidate.
Polls show tight Senate race between Susan Collins and Graham Platner
Democrat surges to 67%17%
Polling data released in mid-June indicated a close contest between Collins and Platner, with Platner holding a slight edge in some surveys, stabilizing Democratic market support after earlier declines.
Graham Platner denies sexual assault allegations amid campaign controversy
Democrat plunges to 50%19%
Following his primary win, Platner faced new sexual assault allegations which he denied, injecting uncertainty and volatility into the race and causing a significant drop in Democratic market support.
Sexual assault allegation against Graham Platner emerges
Democrat drops to 64%14%
An allegation of sexual assault against Platner surfaced shortly after the primary, causing significant controversy and leading to some Democratic endorsements being withdrawn. This negatively impacted the Democrat's market probability.
Graham Platner wins Democratic Senate primary in Maine
Democrat dips to 73%3%
Platner secured the Democratic nomination with over 70% support, setting up a general election contest against incumbent Republican Susan Collins. This solidified the two main candidates and influenced market pricing accordingly.
Graham Platner wins Democratic primary for Maine Senate
Democrat dips to 76%2%
Platner won the Democratic primary with over 70% support, defeating Governor Janet Mills who suspended her campaign. This secured Platner as the Democratic nominee to face Republican incumbent Susan Collins, setting the stage for a competitive general election.
Democratic Governor Janet Mills suspends Senate campaign, boosting Platner's chances
Democrat rises to 78%1%
Janet Mills ended her campaign for the Democratic Senate nomination, leaving Graham Platner as the leading Democratic candidate. This consolidation of the Democratic primary field increased Platner's prospects and influenced market confidence in the Democratic outcome.
Senator Susan Collins retains financial advantage despite Democratic fundraising gains
Democrat rises to 78%2%
As of mid-April, Senator Collins maintained a cash advantage over her Democratic challengers, including Platner and Mills, which could influence the general election dynamics. However, the strong polling leads for Democrats kept market confidence tilted towards the Democratic outcome.
Maine People’s Resource Center poll shows Platner's commanding 33-point lead over Mills
Democrat rises to 77%3%
A new poll released April 7 by the Maine People’s Resource Center showed Platner leading Mills 61% to 28% in the Democratic primary, a significant increase from previous polls. This widening lead reinforced Platner's momentum and boosted market confidence in the Democratic outcome against Collins.
Democratic primary battle intensifies as Mills launches attack ads against Platner
Democrat rises to 73%3%
Governor Janet Mills launched attack ads targeting Graham Platner's past controversial comments, aiming to energize female voters and challenge Platner's lead. Despite the attacks, Platner maintained strong polling numbers, indicating resilience and continued market confidence in his candidacy.
Emerson College Poll shows Graham Platner leading Democratic primary and both Democrats ahead of Susan Collins
Democrat rises to 74%4%
The Emerson College Poll conducted March 21-23 showed Platner leading Mills 55% to 28% in the Democratic primary and both Platner and Mills leading incumbent Republican Senator Susan Collins in hypothetical general election matchups. This poll highlighted Platner's strong support among male voters and contributed to increased market confidence in the Democratic candidate.
Poll shows tight general election race between Susan Collins and Janet Mills
Republican dips to 27%4%
A poll indicated a close general election contest between incumbent Susan Collins and Democratic Governor Janet Mills, with Collins and Mills nearly tied. This suggested a competitive race, contributing to some volatility in market prices for both parties.
Poll confirms Graham Platner maintains lead over Janet Mills in Democratic primary
Democrat rises to 74%3%
Another poll confirmed Platner's sizable lead over Mills in the Democratic primary, reinforcing his status as the frontrunner. This sustained momentum likely kept Democratic market prices elevated and pressured the Republican side.
Senator Ruben Gallego endorses Graham Platner in Maine Senate race
Democrat rises to 72%3%
Democratic Senator Ruben Gallego endorsed Graham Platner, highlighting Platner's appeal as a combat veteran and outsider candidate. This endorsement from a prominent Democrat increased Platner's credibility and likely contributed to the rise in the Democratic market price.
Poll shows Graham Platner leads Gov. Janet Mills in Democratic Senate primary
Democrat rises to 71%2%
A new poll revealed Graham Platner holding a significant lead over Gov. Janet Mills in the Democratic primary, signaling a shift towards a more progressive candidate. This boosted the Democratic market price as Platner was seen as a strong contender to challenge Collins in the general election.
UNH Poll Shows Graham Platner Holding Commanding Lead Over Janet Mills
Democrat rises to 71%2%
A new University of New Hampshire poll showed progressive newcomer Graham Platner leading Governor Janet Mills by 38 points in the Democratic primary and leading incumbent Susan Collins by 11 points in a general election matchup.
Senator Susan Collins announces reelection bid for Maine Senate seat
Incumbent Republican Senator Susan Collins officially announced her bid for a sixth term, setting the stage for a competitive race. This announcement solidified the Republican presence in the race, maintaining market confidence in her candidacy but also highlighting the challenge ahead given Maine's shifting political landscape.
House Republicans report strong fundraising entering 2026 midterms
House Republicans, including vulnerable members, reported strong fundraising in late 2025, signaling robust GOP efforts to maintain control amid challenging midterm conditions. This broader GOP momentum may have influenced Senate race dynamics including Maine.
Republican super PAC invests $42M to support Susan Collins’ reelection
The Senate Leadership Fund announced a $42 million investment to support incumbent Republican Senator Susan Collins’ bid for a sixth term. This significant financial backing underscored Collins’ strength and the competitiveness of the general election race in Maine.
Massachusetts Governor Maura Healey endorses Janet Mills
Democrat rises to 74%4%
Governor Maura Healey of Massachusetts endorsed Janet Mills in the Democratic primary, highlighting Mills’ record of standing up to Donald Trump and delivering results for working families. This endorsement added to Mills’ growing list of high-profile supporters.
Senator Susan Collins announces reelection bid with strong fundraising
Republican dips to 27%3%
Incumbent Republican Senator Susan Collins officially announced her reelection campaign, entering the race with over $8 million cash on hand, reinforcing her position as a formidable candidate despite Maine's shifting political landscape.
EMILYs List poll finds Platner unelectable against Collins
Democrat rises to 70%2%
A poll conducted for EMILYs List, which endorsed Mills, found that Platner would lose to Republican Susan Collins by a wide margin when voters were informed of his controversial past posts and tattoo. This poll reinforced concerns about Platner's general election viability and boosted support for Mills.
Graham Platner wins Maine Democratic Senate primary despite controversies
Democrat rises to 71%3%
Platner secured the Democratic nomination for U.S. Senate in Maine, overcoming controversies and a strong challenge from Janet Mills. This solidified the general election matchup against incumbent Republican Susan Collins.
Poll shows Janet Mills leads Platner amid controversy
Democrat jumps to 68%12%
A SoCal Strategies poll showed Janet Mills taking a lead over Graham Platner in the Democratic primary following the controversies surrounding Platner's past posts and tattoo. The poll indicated a significant shift in voter support favoring Mills, reflecting the impact of the negative publicity on Platner's campaign.
Democratic candidate Daira Smith-Rodriguez drops out endorsing Mills
Democrat rises to 70%2%
Daira Smith-Rodriguez, a Democratic Senate candidate and military sexual assault survivor, dropped out of the race and endorsed Janet Mills, citing Platner’s past controversial remarks as disqualifying. This consolidation of support strengthened Mills’ position in the primary.
Graham Platner controversy over Nazi symbol tattoo emerges
Democrat rises to 58%2%
Democratic candidate Graham Platner faced backlash after revelations that a tattoo on his chest resembled a Nazi symbol. Platner apologized and covered the tattoo, claiming he was unaware of its connotations. This controversy raised questions about his electability and caused polling shifts in the Democratic primary.
Maine Senate candidate Graham Platner apologizes for past social media posts
Graham Platner apologized for controversial past social media posts criticizing police and rural Americans, which sparked public scrutiny and raised questions about his electability. Despite the controversy, he maintained momentum in the Democratic primary.
Maine Gov. Janet Mills announces Senate run against GOP Sen. Susan Collins
Democrat jumps to 58%6%
Janet Mills officially launched her campaign for the U.S. Senate, positioning herself as the Democratic Party's best chance to defeat incumbent Republican Susan Collins. This announcement introduced a competitive Democratic primary and shifted market expectations toward a stronger Democratic challenge.
Janet Mills announces Senate run, shifting race dynamics
Democrat rises to 56%4%
Maine Governor Janet Mills officially announced her candidacy for the U.S. Senate, positioning herself as the Democratic establishment's preferred candidate to challenge Republican Susan Collins. Her entry caused several election forecasters to move the race from 'leans Republican' to 'toss-up,' reflecting increased competitiveness and a more proven challenger for Collins.



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