One reason that Newt might stick around a while is that his wing of the party (rural, right-wing) is more enthused about him than Romney’s wing of the party (more urban, not as right-wing) is about Romney. Political scientist Michael P. McDonald:
In (Florida) counties where Gingrich did better, Republican turnout was up over 2008. In counties where Romney dominated, turnout was lower.
Romney draws his strength from urban counties and Gingrich draws his from rural counties. The suburbs appear to the the battleground region with Romney winning suburbia in two of the three truly contested races so far.
The Florida turnout pattern was also evident in Iowa and South Carolina. Turnout was at least on par with 2008, if not higher, in Iowa and South Carolina because these states have more rural voters that were excited to vote for someone other than Romney.
I don’t buy into the idea that the Republican base won’t turn out for Romney in November. Roger Ailes and the rest will get these nuts riled up about ACORN and soshulism and the rest. But this data is interesting nevertheless.