US Midterm Betting Odds Diverge Across Prediction Markets

Prediction-market pricing for the 2026 US midterm betting odds presented a sharply divided picture in data verified on August 27, 2026. Kalshi priced Democrats at 85% to control the U.S. House and Republicans at 15%. The same table showed a much tighter Senate market, with Republicans at 53% on Kalshi and Democrats at 47%.

Polymarket’s House figure requires more caution. The August 27 Covers table listed Republicans at 88% and Democrats at 13% for House control, while Benzinga reported on September 1 that Polymarket had Democrats at 89% to take the House.

(SOURCE: Kalshi)

Those figures conflict, so they should not be combined into a single verified Polymarket range. The available evidence shows that the Kalshi House market favored Democrats, while the published Polymarket readings differed by source and snapshot.

That distinction matters because prediction-market prices are market-implied probabilities, not polls or guarantees. They reflect traders’ views on a particular platform at a particular time, and the figures can change as trading and information evolve.

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