Romney continues to insist that MassCare is “a good model” for reform. Our current president seems to think so, too: As Tanner notes, Obama’s approach to remaking health care is “substantially the same as Romney’s.”

Nor can libertarians be comfortable with Romney as limited government’s standard-bearer. Asked in 2007 whether he shared President George W. Bush’s belief that the president has the power to arrest and imprison American citizens without review, Romney said that he’d like to hear the pros and cons from smart lawyers before making a decision.

His foreign policy positions reflect a jingoistic (and increasingly unpopular) bellicosity, and he wants to increase an already-swollen Pentagon budget by $50 billion a year.

But Romney’s biggest problem is this: It’s difficult to tell what his core political principles are, if indeed he has any. Running for governor in 2002, Romney proclaimed “I will preserve and protect a woman’s right to choose and am devoted and dedicated to honoring my word in that regard.”