Florida: Former Sen. George LeMieux (R)
LeMieux officially announced his Senate candidacy on April 5, saying that he is running because he believes "the stakes have never been higher."
LeMieux joins state Senate President Mike Haridopolos and former state House Majority Leader Adam Hasner in the GOP race. The winner of the primary will face Sen. Bill Nelson (D), who is running for his third term.
LeMieux was appointed to the Senate in 2009 by Gov. Charlie Crist when Sen. Mel Martinez (R) left the Senate before his term was up. Before that, LeMieux was Crist's chief of staff. LeMieux recently defended his past relationship with Crist, who left the GOP to run for Senate as an independent last year, saying, "When he walked away from the party and our policies, I didn't walk with him."