Kaine declared his candidacy for Governor of Virginia in 2005 in a bid to replace Mark Warner (who was constitutionally unable from serving another term. Kaine won in an uncontested Democratic primary, and faced Republican Attorney General Jerry Kilgore in the general election. Kaine won with 51% of the vote, to Kilgore's 46%. Kaine served as governor from 2006 to 2010. After becoming governor, Kaine gave the Democratic response to the 2006 State of the Union Address. He later became the 51st Chairman of the Democratic National Committee, serving from 2009 to 2011.