If Dean does manage to pull it off in Iowa, would the results of the rest of the primaries be primarily a Dean sweep, or would Edwards/Kerry still provide for an exciting race?
I think it depends on how much Dean wins by and who comes in second. If, say, Edwards come in second by just a couple of points, the media will report it is as a weak showing for Dean and a strong showing for Edwards. If Dean and Gephardt finish one and two and Kerry or Edwards is a few points below that, I don't see that either of them (Kerry/Edwards) will be able to immediately replace Howard Dean as the front runner.
But, frankly, I expect Howard to win both Iowa and New Hampshire and the nomination. I think the surges of Edwards and Kerry in Iowa and Clark in New Hampshire are simply too little, too late to stop the Dean machine.