[pseudoramble]

That's a neat point. My gut reaction is that there probably hasn't been enough people migrating to make a big difference. As in, I doubt enough people left CA to make it cut Republican and I doubt enough people moved to SC to make it cut Democrat. But that's just a gut reaction - I have no clue really.

It's a neat possibility to think about though. If there were enough people who did that, it would really depend on the demographics moving and where they're going. It could swing the election either way. I wonder if anyone has found numbers on this and attempted to model it.