In February 2007, Obama made headlines when he announced his candidacy for the 2008 Democratic presidential nomination. He was locked in a tight battle with former first lady and then-U.S. senator from New York Hillary Rodham Clinton. On June 3, 2008, Obama became the Democratic Party's presumptive nominee after winning a sufficient number of pledged delegates during the primaries, and Clinton delivered her full support to Obama for the duration of his campaign. On November 4, 2008, Barack Obama defeated Republican presidential nominee John McCain, 52.9 percent to 45.7 percent, to win election as the 44th president of the United States—and the first African-American to hold this office. His running mate, Delaware Senator Joe Biden, became vice president. Obama's inauguration took place on January 20, 2009.