Prediction Markets Tighten in Maine Senate Race After Allegations Surface

On Kalshi, the Democratic share price dropped from 72 percent on May 21 to 52 percent as of June 5. The same market briefly showed Republican incumbent Susan Collins ahead at 52 percent to Platner’s 48 percent earlier on June 5 before tightening again.

The New York Times report described claims from multiple former partners, including one who alleged physically aggressive behavior. Platner has denied the allegations of violence. >"There are some allegations in this piece that I just want to be kind of unequivocal about, are simply not true.

" — Graham Platner, June 5 (MS Now with Chris Hayes) Platner also addressed earlier controversies involving messages sent while married and resurfaced online posts.

Democratic donors and strategists are divided on whether to continue supporting Platner, according to Politico reporting published June 4. Some view him as the strongest option to defeat Collins; others worry the controversies could hurt him with moderate voters.

Maine law permits Democrats to replace a nominee who withdraws before mid-July, but party leaders have not indicated any such step is under consideration.

Public head-to-head surveys had previously shown Platner competitive with Collins. Prediction markets, which aggregate expectations about future developments rather than current voter intention, have repriced the race more quickly. The shift coincides with the timing of the New York Times report and earlier coverage of past controversies.

Traders now assign a higher probability that late developments could affect the November outcome.