The question that comes to my mind is, how easy is it for Dems to jump registration and vote in the Rep. primary? Given the NYC type retirees in SoFL, that could spell an easy Guiliani win from crossovers.
Florida is a closed-primary state, so they'd have to re-register as Republicans. That would make them ineligible to vote for the Dems in any down-ballot primaries. I don't see a lot of crossover potential here.