Will Cain drop out of the race?

At yesterday's press conference, he said it "ain't gonna happen," but a bunch of betters on Intrade are wagering that it might. In one day, the chances of him pulling out by the end of the year had jumped from around 20 percent to almost 30 percent. At last check it was back down to 25 percent. Meanwhile, he's given a 4.9 percent chance of winning the nomination; Mitt Romney is coasting at 68 percent and no one else is close.