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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 RubioCongress faces growing health care crisis in Puerto Rico The Hill's 12:30 Report Colbert mocks Trump for sipping water during speech on Asia trip 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 NelsonReport: FCC chair to push for complete repeal of net neutrality Collins: Pass bipartisan ObamaCare bills before mandate repeal Democrats scramble to contain Franken falloutĀ  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.