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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 RubioO'Rourke's rise raises hopes for Texas Dems down ballot Meghan McCain calls Russian attacks against her father the 'highest compliment' to her family The Memo: Saudi storm darkens for Trump 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 NelsonDemocrats slide in battle for Senate Election Countdown: Small-donor donations explode | Russian woman charged with midterm interference | Takeaways from North Dakota Senate debate | O'Rourke gives 'definitive no' to 2020 run | Dems hope Latino voters turn Arizona blue Election Countdown: Florida Senate fight resumes after hurricane | Cruz softens ObamaCare attacks | GOP worries Trump will lose suburban women | Latest Senate polls | Rep. Dave Brat gets Trump's 'total endorsement' | Dem candidates raise record B 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.