According to Pew's latest survey,
a majority of Republicans are dissatisfied with their candidates ...
... which perhaps is not a surprise given that a majority of Americans think neither Newt Gingrich nor Mitt Romney understand the problems facing average Americans:
Meanwhile, most Americans think President Obama understands their problems. That's a real problem for Republicans—so it's no surprise they've got the Bad Candidate Blues.
Republicans would probably love to press the reset button and start this whole thing over, but even if they did have a decent candidate waiting in the wings, as Meteor Blades pointed out, it's too late.