Senate odds narrow to seven races with Iowa a coin flip

Iowa is a coin flip in the Senate markets, and that single line says more about how the chamber call now rests than any aggregate number. On Polymarket the Republican YES on the 2026 Iowa Senate race last printed at 0.505, with an offer of 0.51, against a Democratic YES at 0.495 and a bid at 0.50 (Polymarket Gamma API, pulled 2026-11-02, roughly 15:45 UTC). It is the only one of the nine Senate races the venue quotes within a single point of even money. The Senate control market has tightened around a familiar range in the final stretch, but the interesting price action has moved down a level, into the individual seats that decide it.

Key Takeaways Polymarket prices the 2026 Iowa Senate race…