2026 Senate map: GOP holds 53–47 edge as 35 seats, including two specials, go to voters

Republicans enter the 2026 midterm cycle with a 53–47 majority in the U.S. Senate, a margin that counts the two independents who caucus with the Democrats in the minority. With control of the chamber at stake, voters will decide 35 Senate races this year. The map includes two special elections to permanently fill the Ohio seat JD Vance vacated to become vice president and the Florida seat Marco Rubio left to be secretary of state.

In addition, nine senators are retiring — five Republicans and four Democrats — creating 11 open seats overall. On the defensive side of the ledger, Democrats are protecting nine incumbent seats while Republicans defend 15. To retake the Senate, Democrats must hold all of their current seats and flip four that are Republican-held — a high bar even with the typical midterm pattern that the party out of power tends to gain ground.

With an unusually large number of open contests and two high-profile special elections on the ballot, the fight for the majority will hinge on where each party can make gains while securing its own territory. As the cycle progresses, polling and fundraising snapshots will clarify which races determine control in November.