Gov. Charlie Crist of Florida - Republican to Independent: Charlie Crist has become unpopular with Republicans in Florida, as well as in Washington, D.C. He angered many when he endorsed Obama’s economic stimulus law. Now running for Senate, he faced a stiff primary challenge from Marco Rubio, a ‘tea party’ movement favorite. Becoming an Independent makes it possible for Crist to stay in the Senate race until the general election.
Stephen J. Coddington/St. Petersburg Times/AP