With the steam Santorum has picked up, and the results already under his belt - imagine what he could do with the kind of funding Romney and Newt have received. He is the only one without a “SuperPAC” as best as I can tell... and when you consider that both Newt and Romney have their big guns turned on Rick - and he still seems to be weathering the attacks relatively well...
Santorum is the highest profile “values” candidate, if the order of his priorities are a little odd (I frankly don’t believe that porn is the biggest values plague in the USA today). Newt is living clean now, but did not use to, and stresses values less than Santorum does. I think Santorum is still a bit green and would make a better presidential candidate in, say, 2020, while Newt is ready now. Of course if it boiled down to Santorum vs. Obama I would vote for Santorum.