Pete is right that Gingrich is hanging tough. The main problem remains South Carolina: He and Santorum split the non-Romney vote. Then it appears the same thing happens again in Florida. I think neither Newt nor Rick can really have a future without a win by Florida.
So it appears that Romney is following the same route to victory followed by McCain, with the addition, of course, of Iowa. Gingrich and Santorum are the rough equivalents of 2008’s Romney and Huckabee, except that Santorum probably won’t be as strong as Huck was in the South.
