It's over.
Sen. Hillary Clinton will drop out of the presidential race on Friday, ending her historic bid for the White House and ceding the Democratic nomination to Barack Obama, ABC News has learned.
Clinton's decision to leave the race ends a long, often bitter battle for the right to challenge Sen. John McCain, R-Ariz., in the general election.
Obama, D-Ill., who claimed victory after clinching the necessary delegates on Tuesday, will be the nation's first African American running with the nomination of one of the country's two major political parties.