Control of the U.S. House and Senate was still up in the air Wednesday, as states across the country tallied votes in neck-and-neck midterm election races.
A set of close contests will determine whether Democrats keep their slim majorities in the House and Senate, or if Republicans will seize control of one or both chambers of the legislature.

Democrats picked up a pivotal Senate seat in Pennsylvania with Republican Mehmet Oz conceding the election to Lt. Gov. John Fetterman. Critical Senate races in Georgia, Nevada and Arizona that will determine the majority were still unresolved, according to NBC News. The Georgia contest, where Democratic Sen. Raphael Warnock narrowly leads Republican Herschel Walker, will head to a runoff on Dec. 6, as neither candidate will garner 50% of the vote.
NBC estimated that Republicans could pick up nine seats, giving them 222 seats and a slight edge over Democrats in the House. But the party came into Election Day hoping to take commanding control of the chamber. States are still tallying votes in many races, so those results could change.
The outcome could make all the difference for President Joe Biden, whose legislative hopes rest on whether Democrats can push his agenda through a hyper-partisan Congress.
Millions of Americans also cast their votes in key races for governor, secretary of state and other offices down the ballot.
Correction: This blog was updated to correct the vote count in Georgia's Senate race. Warnock had a slight lead over Walker as of Wednesday afternoon.
Visit NBC News for the latest governor, Senate and House midterm elections results.