Former vice president Joe Biden began his presidential campaign on April 25, 2019 by releasing a video announcing his candidacy in the 2020 Democratic Party presidential primaries. The campaign concluded with him and his running mate Kamala Harris defeating incumbent Republican president Donald Trump and vice president Mike Pence in the general election. Biden, the vice president of the United States from 2009 to 2017 and a former U.S. senator from Delaware from 1973 to 2009, had been the subject of widespread speculation as a potential 2020 candidate after declining to be a candidate in the 2016 election, which saw Donald Trump winning over Hillary Clinton, who was supported by Biden.