Romney claimed "electability" as his ace in the hole. Indeed that at times seemed to be the only argument for his nomination. But this week Romney proved himself to be a very flawed candidate, with a tin ear to the world in which people live paycheck to paycheck. That Romney consistently was showed as the most "electable" in polls represented nothing more than people simply repeating to pollsters what the common perception was of Romney was. There was no foundation behind the conclusion, no reason to believe a terribly flawed Romney, despised by his own party, would be a good general election candidate.
Further clouds are on the horizon. If Rick Santorum finishes fourth, which is very possible, he may choose to drop out further consolidating the anti-Romney vote with Gingrich.
PREDICTION: The finish today will be Gingrich, Romney, Paul and last Santorum. The third and fourth place finishers could flip but I'm predicting Paul eeks out a third place finish.