I must admit that I didn't follow the link. I saw the map in USA Today and thought it interesting.

The map points out a division amongst Americans. If we are interested in people and/or politics then we should be concerned that such major divisions exist. After all people are just people, all pretty much the same. There's just as many good folks in the country as in the city. Why should there be SUCH a difference in their politics? I would have thought that Television and modern communications would have smoothed out such differences long ago.

Are we still voting according to the prejudices of our parents?