Michael Barone is one of the best students of the political process in the United States. He writes in a recent post about current demographic shifts in the U.S. In summary, the South and West are gaining at the expense of the East and Mid-West. He concludes that this internal migration will benefit Republicans, to some degree.
However, the largest amount of out migration experienced by any state is in California. California loses about a quarter of a million people per year as people move to other states with lower tax rates and better job opportunities. This was particularly interesting to me as the other DrC and I are examples of that out migration, having left California for Wyoming several years ago. Moving from the nation's most populous state to its least populous state was quite a change.