The Big Sort

America may be more diverse than ever coast to coast, but the places where we live are becoming increasingly crowded with people who live, think, and vote as we do. We've built a country where we can all choose the neighborhood--and church and news show--most compatible with our lifestyle and beliefs. And we are living with the consequences of this way-of-life segregation. Our country has become so polarized, so ideologically inbred, that people don't know and can't understand those who live just a few miles away. The reason for this situation, and the dire implications for our country, is…