Florida is a closed primary state.
Well, they apparently let independents “declare” as Republicans on the spot, so that’s not really closed.
Florida was closed in name only. Exit polling showed 17% of voters were Independents and 3% were Democrats. This is explained by the fact the Democrat primary was meaningless, so many Independents and some Democrats registered as Republicans with the specific intent of voting for McCain.
Romney won the self-identified Republican vote in Florida. Read the exit polling results.
That's what the law says. That isn't what happened. Poll workers permitted some people claiming to be "independents" access to Republican ballots.