The midterm elections on Tuesday will determine which party controls the chambers of Congress for the next two years.
Democrats are playing defense in blue-state strongholds like New York, Washington and Oregon as they aim to hold on to the House of Representatives. Republicans need only a net gain of five seats to regain control of the House.
A handful of swing state showdowns will decide the fate of the Senate, which is currently split 50-50. Some of the key Senate races to watch are in Arizona, Nevada, Georgia and Pennsylvania.
A Republican triumph in either the House or the Senate has the potential to curtail Joe Biden’s presidency and set off two years of fierce political battles ahead of the 2024 race for the White House.
Dozens of governorships, secretaries of state and attorneys general are also on the ballot.