Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Vote-Counting Starts in US Senate Runoff Elections in Georgia Ken Bredemeier Polls closed and vote-counting started Tuesday night in two pivotal U.S. Senate runoff elections in the southern state of Georgia that will determine political control in the Senate during the first two years of President-elect Joe Biden's term in the White House. Republican Senator David Perdue faced a challenge from Democrat Jon Ossoff, a television documentary producer, while Republican Senator Kelly Loeffler, one of the wealthiest lawmakers in Congress, was opposed by the Rev. Raphael Warnock, a Baptist minister. Pre-election polls showed tight contests, with the Democrats holding slight leads. At the moment, Republicans control the 100-seat Senate with a 50-48 advantage, needing to win one of the two Georgia contests to maintain their advantage and act as a bulwark against Biden's legislative proposals after he is inaugurated January 20. Victories for Ossoff and Warnock would give Democrats a 50-50 split with Republicans and a chance for Vice President-elect Kamala Harris, who will be able to preside over Senate proceedings when she chooses, to cast tie-breaking votes in the Democrats' favor. WATCH: VOA Reports from Georgia .