The real problem Santorum has with the 'jmfcst's of the Party is cultural. He agrees with the hive-mind on most socio-religious issues, but his style - that of the sweater-vested Northeastern high churcher - is so far removed from what they want that they cannot stomach it. The populists need someone just like them, not only insofar as their views go, but also their lifestyle.
In other words: He might be taking orders from The Vatican!
You've made your bed, though. The GOP encourages the hive-mind to vote in lockstep, for men identical to them. And they will not be happy until they have a man identical to them. You do not have my sympathy.