US midterms 2026 numbers reveal the scale of the November battle for Congress. All 435 House seats are on the ballot, 35 Senate contests are scheduled, Republicans hold a 53-47 advantage, and Democrats need a four-seat net gain to take Senate control. US midterms 2026: The numbers behind the battle for Congress The November 3 US midterm elections will decide who controls Congress during the final two years of President Donald Trump’s c