Joe Biden became Barack Obama's Vice President in 2009.
Barack Hussein Obama II ( [ bəˈrɑːk_huːˈseɪn_oʊˈbɑːmə ] ; born August 4 , 1961 ) is an American politician who served as the 44th President of the United States from 2009 to 2017 . Joseph Robinette Biden Jr. ( [ ˈdʒoʊsᵻf_rɒbᵻˈnɛt_ˈbaɪdən ] born November 20 , 1942 ) is an American politician who was the 47th Vice President of the United States from 2009 to 2017 , having been jointly elected twice with President Barack Obama . In the 2008 U.S. presidential election , Barack Obama chose Biden to be his running mate in the race , which they won .