A sign is seen as voters line up for the U.S. Senate run-off election, at a polling location in Marietta, Georgia, U.S., January 5, 2021.Mike Segar | ReutersBoth Senate runoff elections in Georgia were too close to call as polls closed on Tuesday night, according to NBC News. The races will determine which party controls the Senate for the next two years. Democrats aim for unified control of Congress and the White House. Republicans want a check against President-elect Joe Biden’s agenda. In one contest, 71-year-old Republican David Perdue runs against 33-year-old Democrat Jon Ossoff. Perdue seeks a second term in the Senate after his first ended Sunday. The other race pits 50-year-old Republican Sen. Kelly Loeffler against 51-year-old Democrat Raphael Warnock. Both elections went to runoffs after no candidate garnered more than 50% of the vote. Biden won Georgia by 11,779 votes in November. NBC News did not call his win over President Donald Trump in the Peach State until three days after Election Day, as officials tallied mail-in ballots. This story is developing. Please check back for updates.Subscribe to CNBC on YouTube.