TALLAHASSEE, Florida (CNN) – Florida Gov. Charlie Crist announced Tuesday he would not run for reelection next year, and instead will seek the seat being vacated by retiring GOP Sen. Mel Martinez. Crist, a Republican elected governor in 2006, will face former state House Speaker Marco Rubio in the GOP primary. Rep. Kendrick Meek, North Miami Mayor Kevin Burns and state Sen. Dan Gelber are all seeking the Democratic Senate nomination.