The exit polls were wrong. They clearly oversampled Mitt Romney supporters. Romney not only didn't win Mississippi. He came in third in both Southern states tonight, keeping Newt Gingrich alive and watching Rick Santorum remain the candidate of conservatives.
Of course, the difference between victory and defeat was rather small. Romney did better among evangelicals than expected. It was a closely fought contest with all three of the main candidates taking around 30 percent of the vote. But another opportunity for Romney to close this out was missed. Republicans need to understand that even if Romney wins -- and the delegate count was barely affected by this, as Romney gets nearly as big a haul as Santorum and Gingrich while already boasting a large lead -- some real weaknesses in his candidacy have been exposed.