There are signs this morning that the Romney campaign is prepping supporters for a loss in South Carolina tomorrow night. The upside — or what people think is the upside — for Romney is his continuing strength nationally. Indeed, the big news of the last couple weeks was that Romney finally seemed to be breaking out of the sub-30 box he’d languished in for so long. But the latest polls show the national primary electorate just as fluid as it was. Frank Newport of Gallup — usually your classic hyper-cautious poll analyst — talked about Romney’s numbers “collapsing” nationwide. I’m not sure I would have used quite that word. But big picture, he’s right. Look at these numbers.