What’s interesting is that Paul and Santorum are actually pulling votes away from Romney far more than they take away from Newt. Newt is pretty much consistently in the 30s across all demos, but on the demos where Paul or Santorum surge, Romney’s numbers crumble. To me this says Newt has taken on a life of his own. He is now the frontrunner and the rest are battling it out as the non-Newts. Newt is now the acceptable standard-bearer of the party, and everyone else is competing for fringe tastes. No idea if these poll numbers will hold up, but obviously with each passing week, the race is likely to get less volatile and these numbers are likely to settle in place.
One reason I haven't agreed that Santorum should leave the race. Theoretically all the evangelicals who just won't vote for Newt are more likely to go for Santorum than Romney. If he leaves, then I thought Romney might benefit. Seems to be supported by the polls.