Crist left the GOP when it became clear he was going to lose a Senate primary to now-Sen. Marco RubioMarco Antonio RubioMilley says calls to China were 'perfectly within the duties' of his job Overnight Defense & National Security — Milley becomes lightning rod Joint Chiefs Chairman Milley becomes lightning rod on right MORE (R-Fla.). Since then he's been moving closer and closer to the Democratic side of the aisle. He gave a speech heartily endorsing President Obama at the Democratic National Convention, and has endorsed Sen. Bill NelsonClarence (Bill) William NelsonHow will Biden's Afghanistan debacle impact NASA's Artemis return to the moon? Biden to talk Russia, anti-corruption with Ukraine's president Blue Origin's Jeff Bezos wages lawfare on NASA and SpaceX MORE (D-Fla.) in his reelection bid against Rep. Connie Mack (R-Fla.). Many in Florida expect him to seek the Democratic nomination for governor next election.