Representative Thomas Massie’s chances of winning against Trump-backed challenger Ed Gallrein in the Republican primary for Kentucky’s 4th Congressional District have plunged one day before the election.
Read more Bill Cassidy Takes Swipes at Donald Trump in Concession Speech
Early Monday, Massie, who had previously been the favorite on prediction markets, slipped down to a 43 percent chance of victory on both Kalshi and Poloymarket, down from 61 percent and 56 percent respectively on Saturday, as in-person early voting ended.
Newsweek has contacted Massie’s campaign outside regular working hours for comment via email.
Read more Tourist Threw Rock at Hawaiian Monk Seal to Protect Turtles: Attorney

Few Republicans have aggravated President Donald Trump as much as Massie, who has been at odds with him over the Department of Justice’s handling of the Jeffrey Epstein files and foreign policy issues.
Trump has regularly derided Massie on social media and endorsed Gallrein, a farmer and former Navy SEAL. The president’s endorsements have long carried significant influence in Republican primaries, and this primary will be a test of his grip on the party even as his approval rating has slipped among some other voter groups.
Read more Thousands in New York, Maryland, California To Stay Inside Over Air Quality
This is a developing story. More to follow.