Joseph Robinette Biden Jr. (/?ba?d?n/ BY-d?n; born November 20, 1942) is an American politician and the president-elect of the United States. Biden defeated incumbent president Donald Trump in the 2020 presidential election. A member of the Democratic Party, Biden served as the 47th vice president during the Obama administration from 2009 to 2017. He represented Delaware in the United States Senate from 1973 to 2009.