The Race
Gil Cisneros, the incumbent Democrat, dominated the June 2, primary in California's 31st U.S. House District, pulling 61.1% of the vote with 94,805 ballots. His Republican challenger, Eric Ching, finished second with 23.8% and 36,999 votes. The general election is set for November 3, and prediction markets vs polls are singing the same tune.
Ratings
The consensus from the big three rating outfits is crystal clear: Cook Political Report, Inside Elections, and Sabato's Crystal Ball all call this district "Solid Democratic." Translation: Cisneros is heavily favored to keep his seat.
Prediction Markets
Bettors on Kalshi and Polymarket are putting their money where their mouths are. As of late June, the betting markets gave the Democratic candidate a 96.98% probability of winning, while the Republican challenger faced just a 3.02% shot. That's not a horse race; it's a coronation with a 97-to-3 scoreline.
Experts vs. Markets
The expert raters and the bettors aren't just in the same ballpark; they're sitting in the same seat. The "Solid Democratic" rating and the 97% Democratic betting odds are essentially saying the same thing. Congressional race forecasts rarely see this level of alignment between traditional Cook Political Report ratings and live Kalshi Polymarket odds.
What does that tell us? The race is essentially decided. Cisneros' dominant primary performance (winning nearly two-thirds of the vote) appears to have settled the prediction markets on what will happen in November. Election prediction accuracy in lopsided races like this one tends to be exceptionally high, which means both the experts and the bettors are probably right: this seat is staying blue.
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