A Newt surge in the next few days helps Romney more than anyone else. Splitting the social conservative vote between Gingrich and Santorum helps Romney get back in the race for Arizona and Michigan. With those under his belt, he's going into Super Tuesday in a much better position.
These surges have been happening in the space of 2 days, 6 is plenty of time.
Exactly. If Newt has a really good night tonight and really gains momentum again, then he could very well get back into the thick of it. Although, based on the debate so far, I think Newt might have a sore throat - it sounds like it's really scratchy.