One result of that movement is the apparent "polarization" of American politics, which bleeding-heart journalists and leftists (who are on the losing side of the "polarization") always portray as a bad thing. See, for example, this article (registration required), which includes these deep thoughts (with my comments in brackets):
The continuing polarization is self-perpetuating, experts noted. As communities become more homogeneous, minority points of view are heard less often [they can always move], and majorities can become more extreme in their thinking [i.e., less tolerant of income redistribution and regulatory repression]....
"There is a huge transformation of our society — the way people are moving around the country [now you've got it] and what's happening in the economy — that is reverberating politically in lots of different ways," Greenberg said. "But any party or individual politician has very little control over these trends" [thank goodness].
If the left could have its way, it would gerrymander the distribution of the population to create more Blue States.
You want to see "polarization"? Go back to 1861.
