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Mr. Rubio on Tuesday sounded like he was channeling Mr. Jindal. He said in an appearance on MSNBC’s “Morning Joe” that Mr. Crist is “part of a bigger change that’s happened in the Republican Party in some circles, and that is this belief that somehow we need to become more like the Democrats in order to win elections.”

The Republican Senatorial Campaign Committee and all of the most senior GOP senators have endorsed Mr. Crist, but a number of conservatives in the party are backing Mr. Rubio.