Mitt Romney oozed confidence and a defiant Newt Gingrich seemed to acknowledge his momentum had been checked, at least for now, as Florida Republicans voted Tuesday to decide who gets the state’s 50 delegates, the biggest prize yet in the Republican presidential nomination contest.

Romney is heavily favored in the winner-take-all primary, the final and possibly pivotal contest in a high-stakes month in which the former Massachusetts governor has claimed one win and two second-place finishes so far. On Monday, he campaigned so optimistically that he broke into song.

Without predicting a winner or endorsing a candidate, Sen. Marco Rubio, R-Fla., told CNN on Tuesday: “The winner of Florida is in all likelihood going to be the nominee of our party.”

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