Because Romney’s weak. He has no base of support of his own, no core values or convictions that we know of, and no backbone on anything. The establishment knows they can pull the strings on him behind the scenes like a puppet and make him do whatever they want. Romney lets them have more power for themselves than any other candidate in the race. Santorum is probably the next weakest personality up there, which is one reason you haven’t seen the establishment come out with the knives for him as much as Newt.
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.