Over the past three decades, America's state and local governments have experienced a large and underappreciated divergence. Some places, usually but not always led by Republicans, have become friendlier to free enterprise. Other places, usually but not always led by Democrats, have become friendlier to big government. Some political scientists call it the Big Sort. John Hood says you can see the self-selection manifest itself in polls, in voting behavior, in migration patterns, and in policy outcomes.