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Crist left the GOP when it became clear he was going to lose a Senate primary to now-Sen. Marco RubioMarco Antonio RubioSenate GOP attempts to wave Trump off second Putin summit GOP senator: We should accept Trump's 'apology' for Russian election interference comments Controversial Trump judicial nominee withdraws 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 NelsonElection security bill picks up new support in Senate Senators share their fascination with sharks at hearing Senate Dems build huge cash edge in battlegrounds 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.