Will the Republican Party retain control of the US Senate in the 2026 midterms?

The Senate is the genuine cliffhanger of the 2026 map — a near coin flip where one or two races decide everything. Democrats have to run the table across a handful of brutal battlegrounds; Republicans need to hold just enough of a red-state firewall. So which way does the upper chamber break? We built it seat by seat — the win odds in every toss-up, the single tipping-point race the majority hinges on, the map-vs-mood tension, the candidate-quality wild cards, and where the markets and models land — then committed to one calibrated probability. The number on the most evenly-matched contest of the cycle. Built from 240 sources.

The probability and full reasoning unlock on purchase, and become public for everyone once the event resolves.