US 2026 midterms: Senate, House and governor control turns on a handful of battlegrounds
Control of Congress and many statehouses in the 2026 US midterms hinges on a small set of competitive battlegrounds rather than the many seats each party is expected to hold. Voters chose senators, members of the House of Representatives and governors in contests widely framed as a referendum on Trump’s agenda. The Cook Report rated six Senate races as toss-ups; Democrats need at least three of those, plus the seats they are already expected to win. Republicans held the Senate majority going in. Thirty-three of the 100 senators are up in the regular cycle, plus two special elections in Florida and Ohio after Marco Rubio and JD Vance resigned to join the executive branch. Senators serve six-year terms, with one-third of the chamber typically elected every two years.
Republicans are defending a majority in the 435-seat House, where members serve two-year terms. Democrats hold 212 seats and need 218. They are favoured in enough districts to take the chamber without winning any of 18 Cook-rated toss-ups if they hold 18 lean-Democratic seats. Republicans, favoured in 195 seats, would have to sweep all toss-ups and flip five lean-Democratic seats to keep control. Gubernatorial contests are underway in 36 states and three territories; each party held 18 of those governorships before the vote, and three incumbents are retiring.
The House initiates revenue bills, impeaches federal officials and elects the president if the electoral college ties; its speaker is chosen by the representatives. The Senate confirms senior appointments including to the supreme court, consents to treaties and tries impeachments. Each state has two senators regardless of population. Georgia and Louisiana require 50 percent or a runoff; Maine and Alaska use ranked-choice voting; some states use top-two primaries that can send two candidates from the same party to the general election.
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