romney still hasn't won in the south
(Map from TPM, follow the link for an interactive version.)
If you know anything about the cultural and political geography of Florida, the above should come as no surprise. Florida is essentially two states: the urban triangle represented by Miami-Orlando-Tampa, and northern-central strip of Pensacola-Tallahassee-Jacksonville. The former is what most people think of when they think of Florida: northern retirees, Jewish people, and Cubans.
The latter is essentially an extension of Alabama and Georgia. And those blue islands in the southern part of the state? Orange groves. That's part of the rural South, too.
I have to hand it to Gingrich: he's playing a long game here. He's seen Romney's weakness in Newt's backyard, and he's going to exploit it to the very end. When he says "Massachusetts moderate", what he really means is "Yankee Mormon". And it's working.
This ain't over.