We are studying an interesting new book from Bill Bishop, The Big Sort: Why the Clustering of Like-Minded America is Tearing Us Apart. Bishop, a reporter from Austin, has been writing about the increasing geographic polarization in America, especially as it shows up in politics. His particular unit of analysis: party votes per county.
One of his big findings is that the proportion of all counties that have lopsided election results - 20% or more - has grown from about a quarter 30 years ago to about half of all counties today. Many states have close elections, but that is because it way-Democratic cities are balanced by the way Republican-suburbs and rural areas.
Moreover, Bishop argues, many counties are becoming so lopsided because people are moving to areas where like-minded people live. There are fewer undecideds, and not much mind-changing. More tomorrow.