According to Pew, Republicans are increasingly unsatisfied with their choices. Another bad sign for the GOP:

About half of independent voters (53%) rate Obama positively in understanding the GOP_Candidates  problems of average Americans; only 38% and 37% of independents, respectively, give Romney and Gingrich positive ratings. Democratic voters overwhelmingly say that Obama understands the problems of average people (84%). Smaller majorities of GOP voters give Romney (61%) and Gingrich (60%) positive ratings.

Kevin Drum notes that brutal primaries increase voter dissatisfaction:

[T]his is the point at which I'd normally remind everyone that it's only January … and there's plenty of time for everyone to cool down before summer. And I think that's exactly what's going to happen. Still, there's that little niggling voice in my head saying "Newt, Newt, Newt….." Will Newt Gingrich, even after he's obviously lost, continue his scorched-earth campaign against Romney? Will Sheldon Adelson fund this doomed effort? I'd guess no. But it's a soft, unconvincing no. He just might, after all.