Democratic Odds in Maine Senate Race Fall on Prediction Markets

Prediction-market traders reduced the odds that a Democrat will win Maine's U.S. Senate race in recent days. On May 23, Polymarket assigned the Democratic candidate a 78 percent chance of victory. Kalshi recorded a similar movement, with Democratic odds declining from 72.1 percent on May 22 to 66 percent on Thursday morning.

The shift occurred while public polling continued to show the likely Democratic nominee leading the Republican incumbent.

Attention On Monday, Democratic Representative Jake Auchincloss of Massachusetts declined to endorse the Democratic candidate and cited a tattoo that critics said resembled the Totenkopf symbol used by the Nazi SS. The candidate has previously apologized for the tattoo and told Newsweek he plans to have it removed.

" He added that it would be a mistake for the Democratic Party to view the candidate's approach as a path to durable majorities. The candidate said the tattoo was obtained in Split, Croatia, in 2006 while intoxicated. Renewed attention has also focused on deleted Reddit posts first reported in October 2025.

" On May 11, The Maine Monitor published what it described as the full archive of the posts. An earlier Pan Atlantic Research survey from February 13 to March 2 had shown a 44-40 lead. The Republican incumbent has represented Maine since 1997. The state supported former Vice President Kamala Harris by 7 points in 2024 and former President Joe Biden by 9 points in 2020.

In the Democratic primary scheduled for June, David Costello and Andrea LaFlamme are also running. The general election is set for November.