Romney's closing was strong and effective. He didn't hit the ball out of the park in this debate, but he did a solid job and he did nothing to stop the momentum which does seem to be headed back his way. He did a good job rebutting Gingrich's attacks.
Gingrich didn't do what he needed to do to clinch Florida. He didn't get a "big moment" like he did in the South Carolina debate, and he had some truly awful moments -- like whining about negative campaigning and calling for a truce. With no more debates for a month, he's in for a long haul, especially if discussion tomorrow turns a the controversy about whether he called Spanish a gutter language. His attempt to attack Wolf Blitzer looked contrived and cynical, and especially ineffective since Santorum beat him to the punch.
Santorum did a great job. Amazing, as I've said, that the anti-Romneyites aren't flocking around him rather than a divisive, flawed guy like Newt. Yes, some of his social stances might be controversial in a general election -- but this isn't really a year when voters are likely focusing on social issues.
Santorum won the debate -- but since Gingrich had a relatively weak night, that means Romney pretty much wins overall.
Totally fair to ask the candidates for their best argument for their own electability.