Nearly every competitive Senate race is currently held by a Democrat. Several are in presidential battlegrounds, including Michigan, Wisconsin, Pennsylvania, Arizona and Nevada.

Gov. Jim Justice has won West Virginia, flipping the seat currently held by retiring Democratic-turned Independent Joe Manchin. This means Democrats must be perfect in every other race on the ballot and win the White House in order to control the Senate again next year. If the Senate ends up evenly divided, it’ll be just the fifth time in U.S. history the chamber has been tied. The last time Republicans controlled the Senate was in 2021.