I don't see how he doesn't win the nomination: he'll win or finish close in Iowa, stay close to Romney in NH, win SC and Florida and at that point it's over. Unless Palin gets in and shakes things up (which would totally be worth it for the entertainment value), I think he's the nominee and, unless the economy turns around, the next president. Then he'll use to power of the office to compel the country to pray for the economy to turn around and lo, thou shall be saved.