Public Policy Polling has come out with the latest survey of Iowa caucus-goers and it looks like a photo finish. Ron Paul leads at 20 percent, Mitt Romney is in second at 19 percent, and Rick Santorum is right behind at 18 percent. PPP sees plausible scenarios where each of the big three could win Tuesday.
Newt Gingrich finishes fourth at 14 percent, Rick Perry next at 10 percent, Michele Bachmann at 8 percent, Jon Huntsman at 4 percent, and Buddy Roemer at 2 percent. Like every other recent poll, it shows Santorum with the momentum -- the former Pennsylvania senator has gained in overall popularity to the point where he has the best net favorability and he has strong plurality support among late deciders -- while Paul has declined. The more traditional the Iowa turnout, the better Romney does. The less traditional, the better Paul does (to vastly oversimplify).