I agree. Santorum was in the Senate for a number of years and made no waves whatsoever, so I think both the RINO establishment and the Dems see him as weak and a "safe" candidate.
Does the name ‘Terri Schiavo’ ring a bell? Does the stand Santorum took against rescindimg the Texas sodomy laws and the ensuing firestorm ring a bell? How about welfare reform? He made waves alright, and the dems hated his guts for it, but he never backed down.