prediction-markets

Prediction markets show Democratic advantage in 2026 House race while Senate remains a tossup

Ethan CaldwellEvent Markets Correspondent

Published September 16, 20263 min read

A brass balance scale with one pan tipped low beside a second, nearly level scale, lit dramatically against dark shadow. — Prediction markets tip decisively toward Democratic House control while Senate odds stay balanced on a knife's edge. Illustration: MarketIntelLabs

Prediction markets now price Democratic House control at 87.5 percent while the Senate sits at 51/50. Polymarket's House control contract has held at that probability through mid-September despite $6.55 million in trading volume, while the Senate market shows a razor-thin margin with Democratic control at 51 cents and Republican control at 50 cents. This 36.5 percentage point gap between chambers reflects the different electoral structures at play: House districts respond to national winds while Senate contests hinge on state-level dynamics and the 2026 cycle map. For our running weekly read on the venue-level odds, see our Prediction Markets Weekly: Fed Rate Path Holds Steady, CPI Markets P…

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