Polymarket priced Hinson at 59% in Senate race as Maine's Collins concedes
Polymarket US gave Republican Ashley Hinson a 59% chance of winning an Iowa Senate seat on November 4, according to NewsNation's election-night review. Hinson lost to Democrat Josh Turek 50.5% to 46.4%. In Maine's Senate race, Republican Susan Collins conceded to Democrat Troy Jackson. Separately, Polymarket US priced Democrat Jon Ossoff at 95% in a race called for Ossoff. The coverage frames Polymarket data alongside traditional polling as a measure of election forecasting accuracy.
The Iowa miss gives state attorneys general in Ohio and Tennessee fresh evidence for their argument that event contracts amplify sentiment rather than predict outcomes. Polymarket's 59% Hinson pricing proved wrong, while its 95% Ossoff call proved right. That split record complicates the forecasting-tool defense the platforms need ahead of likely 2027 proceedings.
Kalshi and Polymarket posted record midterm volume, with millions of retail users now encountering these prices through Bloomberg and CBS News embeds. Senators Warren and Curtis have demanded internal trading data under bipartisan deadline. The mixed accuracy both helps and hurts: each miss feeds gambling lawsuits, each correct call weakens them. Competitors now face pressure to prove which prices reflect information and which reflect positioning.