Bolstered by positive poll numbers, Republican presidential candidate Mitt Romney on Saturday sought to vanquish rival Newt Gingrich in Florida with a biting new ad about ethics charges and a mocking tone about his debate complaints.

Just three days ahead of a pivotal primary race that could determine who has the momentum to win the Republican state-by-state nominating battle, the two men spent the day traveling around Florida in a final weekend search for undecided voters.

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