Washington: Raphael Warnock and Jon Ossoff defeated Republican incumbents Kelly Loeffler and David Perdue respectively in the Senate elections in the state of Georgia giving the Democratic Party control of the US Senate.
The Democrats already control the Congress, albeit with a reduced majority after they lost key seats in the recent elections.
Thus for the first time since 2009, the Democrats will be in control of the Senate, the House of Representatives and the White House, a BBC report said.
Mr Warnock, a Baptist pastor, thus becomes the first black senator for Georgia – a slavery state in the US Civil War – and only the 11th black member of the Senate in the history of the United States.
An estimated four million Georgians turned out to vote in the run-off election.
The result is a severe blow for outgoing Republican President Donald Trump.
The Georgia election was rerun because none of the candidates in the November general election achieved the 50% needed for victory under state rules.