It’s not strictly true that a Paul win in Iowa automatically helps Romney to the nomination. It’s probably true in the sense that Romney is likely to finish second at worst, but what if he finishes fourth or even fifth behind Paul, Gingrich, Bachmann, and/or Perry? That’ll wound him badly headed into New Hampshire; meanwhile, if Gingrich finishes second in Iowa, he (and Huntsman) would be in good shape to become the Stop Paul/Not Romney candidate in New Hampshire.