Santorum has a lifetime ACU rating of 88.1.
A good rating, and here’s some more insight from an April 30, 2011 article:
“consider first the other folks who either are running or seem to be considering it very closely. Romney, Huckabee, Pawlenty, Gingrich, Bachmann, Palin, and Trump seem like the frontrunners. Among that group, only Palin and Bachmann are as consistently conservative as Santorum — and those two wonderful ladies may choose not to run.”
excerpt http://www.americanthinker.com/2011/04/santorum_2012.html
Although now it looks like Bachmann will run, and the lovely Sarah is still a mystery. Any one of those three would be an outstanding POTUS.