I understand that expectations are higher, and so he has more to lose and less to win, BUT...if you are in the lead, you have to tread water. That's called winning. Earn delegates, eat up the clock. He'll be tested down south, but how would he rather arrive at that test, on a winning streak or not?
If I were Romney I’d rather split IA/NH with someone else (preferably with Rudy or McCain) and win SC and FL than win the first two and lose the next two. I’d think he’d have far more momentum from the first scenario than the second.