On the weekend before the pivotal Florida primary, Newt Gingrich vowed today to stay in the race for the Republican presidential nomination until the national convention this summer even if he loses Tuesday’s vote. Front-runner Mitt Romney poured on the criticism of his rival in television ads airing across the state.

Gingrich’s pledge, in a race defined by unpredictability, raised the prospect of an extended struggle inside the party as Republicans work to defeat President Barack Obama in the fall.

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