From a reader:

Just to take the burden of being witness to my predictions off my wife for a night, the following will happen at the debate:
Romney will look a little shook up, a little off, and show that he is not a good come from behind candidate. He will force things here and there and just be a little…off. When leading that gets overlooked, but not now.
Huckabee’s empty-suitness will be slightly more apparent, since he is not a good frontrunner. He will have to flesh out some policy ideas and look like he belongs next to giuliani, mccain and even thompson, but will fail and be not that convincing.
McCain will completely (and inexplicably) blow his chance to cozy up to us conservatives, getting stuck on his ego autopilot.
Giuliani will be controlled, (tactically) conservative, not trip up, and try not to upset the Undocumented-Standoff occurring within the field.
Thompson will be tempting enough to garner some attention, be be lost in the crowd because he didn’t dream of this moment since he was 5.