Oh sure. Romney always stands on principles. Only problem is, it doesn't matter particularly to him whether they are conservative or liberal "principles." Then, when he finds them inconvenient, he hops off quicker than a cat on a hot tin roof.
Given the he!! he's gone through in the trenches with the 85% liberal legislature in Massachusetts, his tune has changed. He has learned a lot through trial by fire (and, no doubt, he's learned from Pres. Bush's mistakes -- he's not stupid).
I can't think of anyone else more suited and better prepared for the fight in Washington than Mitt Romney.