Delegates to the US Democratic National Convention are voting online to select Vice President Kamala Harris as their nominee for president.

President Joe Biden threw his support behind Harris after dropping out of the race in late July. Nearly 4,700 delegates are taking part in what they call a "virtual roll call." They started casting their ballots on Thursday and will wrap up Monday evening.

No other candidates qualified to challenge Harris, who already has enough support from pledged delegates. That means she will see her name atop the Democratic ticket by next week before announcing her pick for vice president.

Harris will formally accept the nomination two weeks later when delegates convene in Chicago for the convention. She will have a little over two months until the November election to convince voters to choose her over the Republican nominee, former President Donald Trump. If she wins, she will become the first woman to serve in the Oval Office.