I think Gingrich actually caught a break with Santorum's rather weak debate performance. Had Santorum performed strongly and turned this into a two-man race, Newt would have been on the outside looking in. Instead, Santorum was weak and Gingrich likely has new life in the South. A three-way pile up is the only way this ends in a convention fight so Gingrich must stay relevant to make that happen. I think the debate opened the door for Gingrich to become the candidate of the South.
Too bad there are only really two states Gingrich could potentially win on Super Tuesday: Georgia and Tennessee.