That evidence is that, as of a few hours before the final pre-Florida-primary debate, he has failed to do what Rick Perry did last week in South Carolina -- end his campaign and endorse Newt Gingrich.
The math isn't that complicated:
- Santorum isn't going to be the GOP nominee, and if his IQ is larger than his shoe size he knows he's not going to be the nominee.
- After Gingrich wins Florida, he'll run the table. He won't need Santorum's endorsement or support, and he won't owe Santorum's social conservative supporters anything at all.
- However, as of today, it is just barely, possibly plausible -- if we stretch things quite a bit -- that Santorum's support could make, or his non-support break, Gingrich's Florida prospects, and that Newt as POTUS would look benevolently upon, and seek to repay the support of, Santorum's social conservative supporters if Santorum delivered said supporters into Gingrich's column. Offer good today only, of course.
I guess we'll find out one way or another within about four hours.