The issue I see with Santorum is he should be able to talk circles around Newt and Mitt, and Obama, and all at the same time. Instead, Newt is better at explaining, contrasting, and selling conservative solutions to the masses, well Rick is seemingly only selling himself as the true conservative candidate.
I think as we saw with the leaked memo about Michelle Bachmann when she was still running...the media decides who gets asked the questions and who gets to answer and gets to stand in the spotlight.
They don’t want Santorum to because they know he’d expose newt and Mitt as the faux conservatives they really are.