Joseph Robinette Biden Jr. is an American politician who is currently serving as the 46th president of the United States since January 20, 2021. Prior to his presidency, Biden served as the 47th vice president of the United States from 2009 to 2017 under President Barack Obama. He also represented Delaware in the U.S. Senate from 1973 to 2009. Biden is a member of the Democratic Party and ran for president multiple times before winning the 2020 election against incumbent President Donald Trump.