Republican Senator Susan Collins faces a challenging race against Graham Platner in the 2026 Maine Senate election. Her chances seem to have diminished with former Governor Janet Mills withdrawing, leaving Platner poised to lead the Democratic effort to flip this critical seat.
Democrats see Maine as a prime opportunity to gain a Senate seat in the 2026 midterms. The state supported former Vice President Kamala Harris by roughly seven points in 2024. Collins has maintained her position over the years due to her popularity and moderate image. However, Democrats believe President Trump’s low approval ratings could impact her chances, offering them a path to gaining control of the Senate.
New Poll Insights
The latest Pan Atlantic Research poll, conducted following Mills’ exit, shows Platner leading Collins. Platner now claims 48% support, while Collins has 41%. About 11% of voters remain undecided. This poll surveyed 827 likely voters between May 8 and May 18, 2026, with a margin of error of 3.7 points.
Previously, Platner had only a four-point advantage over Collins in a similar poll from February to March 2026. This increase reflects a notable shift in voter sentiment.
Campaign Reactions
“Polls haven’t been particularly useful in predicting outcomes in our campaigns,” said Shawn Roderick, Collins’ campaign spokesman.
The campaign remains cautious about relying on polls due to past inaccuracies. Notably, a similar poll previously showed Collins trailing Sara Gideon, yet she secured victory.
Comparative Polling Trends
Other polls have also shown Platner leading. An Emerson College poll reported Platner with 48% support to Collins’ 41%. This survey included 1,075 likely voters with a 3.1-point margin of error.
Collins’ supporters highlight her past performance, recalling her 2020 victory despite trailing in polls. Nonetheless, Democrats argue that current national conditions are more favorable to them. Rising concerns over Trump’s approval, particularly regarding economic issues, could hinder Collins’ campaign.
Prediction Markets and Current Forecasts
Democrats appear favored in prediction markets such as Kalshi and Polymarket. They hold a 70-73% chance of winning the seat, based on trading sentiment. Although useful, these markets don’t necessarily predict outcomes with certainty.
Political analysts like the Cook Political Report still categorize the race as highly competitive.
Platner’s Path as Democratic Nominee
Mills’ exit positions Platner as the leading Democratic candidate. Before her withdrawal, he had already gained ground in primary polls.
However, Platner is not without controversy. Past social media posts and a tattoo linked to Nazi imagery have raised concerns about his appeal to moderate voters. Platner has apologized and plans to remove the contentious tattoo.
The Stakes for Democrats
Flipping the Maine Senate seat is crucial for Democrats, amid expectations set by historical midterm election trends favoring the opposing party of the sitting president. Trump, facing widespread disapproval, could influence Republican prospects negatively.
Despite a favorable overall environment, winning the Maine seat remains essential for Democrats. They aim to gain four seats to secure a Senate majority. Besides Maine, North Carolina presents another potential flip, though more conservative states must also be targeted.
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