I asked a Newt supporter I know about Santorum. He said that he sees Santorum as too crazy regarding culture wars.
I think this underscores a key difference between Newt voters and Santorum voters that many don't consider. Gingrich uses economic points to outline our social situation (as does Romney), whereas Santorum uses social points to outline our economic situation. While they all may be "conservatives", Newt's supporters take their marching orders from a different line of rhetoric than Santorum's. I think a larger amount of Newt's supporters - more than most expect (at least 40%) - will find a better fit with Romney in the end.
