Charles P. Pierce says no:
There's bound to be a great settling beginning right about now. Romney's gotten about as much out of his relentless pandering as he's likely to get — He talked last night about both "the Death Tax" and "a Democrat Congress." His wingnut jargon coach deserves a raise — and so we are likely to hear more of what we heard last night, which was some preposterous jaw-flapping about how honest and steadfast he always has been in his principles. This is what will constitute "a move to the center." Romney can't shift any of his actual positions to the center without looking even more ridiculous than he has over the last year. So he will shift his rhetoric in that general direction in the hopes that, by November, enough people will have forgotten what a complete political 'ho he's been since 2007 to give him a shot in the general election.
The Dish 