The Race
Illinois's 12th U.S. House District is shaping up as a textbook mismatch as incumbent Mike Bost faces Democrat Julie Fortier in what experts and prediction markets are calling a Republican lock. The general election is set for Nov. 3, 2026, and the consensus is deafening.
Ratings
The March primary told the story loud and clear. Bost won uncontested with 81,400 votes, while Fortier won the Democratic side with a more modest 26,791. This nearly 3-to-1 gap in primary turnout is the kind of number that keeps Democratic strategists uncertain.
The consensus race rating from Cook Political Report, Inside Elections, and Sabato's Crystal Ball pegs this district as Solid Republican, meaning Bost should win comfortably, barring some extraordinary development.
Prediction Markets
As of late June, betting platforms give Republicans a 92.53% probability of victory, with Democrats sitting at just 7.47%.
Experts vs. Markets
When midterm race ratings align this perfectly with election prediction markets, the district has essentially settled its business already. The Kalshi Polymarket odds aren't hedging their bets or leaving room for a surprise upset. They're reflecting what the data clearly shows: this is Republican territory, Bost is entrenched, and Fortier faces a mountain that looks more like a cliff.
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