Your premise assumes he will be asked about F and F and libya. Based on past debates they will hammer mitt on the 47 percent comment and give obama softballs. Oh they might ask “tell us what you would say to those americans still out of work?” Or “what do you say to those americans who want a home but can’t afford one?” Or some such crap.
Mitt can handle anything they toss at him. He didn’t spend months dealing with the best debaters, Newt, Cain and the others, and not keenly hone his message. Obama on the other hand has been lazy. He takes nothing hard from the press, and therefore can’t give a cohesive answer even if he knows the questions ahead of time.