My Plum Line post today is a fun piece (if I do say so myself) about the "party actor" track vs. the "reality show" track in GOP presidential politics. I think it holds up; let me know if you disagree.
One of the implications, or perhaps one of the things we've learned, is that practically any candidate can get a polling surge at this stage of the process, but those surges have very little to do with the actual competition for the nomination. Thus the current Herman Cain polling triumph, analyzed in depth and I think correctly by Mark Blumenthal.
...or, at least, it seems as if any candidate can get a polling surge. Rick Santorum hasn't had one yet, but I don't see any reason he couldn't. Almost anyone can.
Apparently, he's immune from both real and reality success, beyond his consistent 10% or whatever it is.