Lets face it, Santorum is a "least worst" choice for conservatives.
I'm not sure about it; even if "he's a kook*" I think a Paul Presidency would be quite interesting... even if all he did was work on the Federal Reserve.
(But I think he'd make some good strides against the War on Rights... um, I mean Drugs, as well.)
* Besides, that's what the confirmation process is about; to allow Congress to make sure (the possibility exists) for some tempering personalities to be on the President's high-staff.