McCain's decision to pull out of Michigan is the news of the day. But here's what strikes me as significant about this: I think this is the McCain campaign telling us that they do not believe the latest shift in the race's momentum is temporary. They believe this is the terrain they are going to have to play on for the final four weeks. And that dictates digging in in the 2004 red states and hoping they can pull off wins in every one of those states.