I'm running for president because I think that, with a lot of help, I can stem the tide of this slide and restore America's leadership in the world and change our priorities. I will argue that my experience and my track record — both on the foreign and domestic side — put me in a position to be able to do that.
Conference call with reporters after announcing candidacy for the 2008 Democratic president nomination (January 30, 2007)
Biden Announces Candidacy for 2008 Presidential Nomination - New York Times