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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 RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration 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 NelsonDem asks airlines to cap airfares ahead of Hurricane Maria Trump encourages Rick Scott to run for Senate Overnight Regulation: House moves to block methane rule | Senators wrestle with allowing driverless trucks | EPA delays toxic waste rule 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.