ValdisKrebs analyses political book buying and finds strong clustering into two camps : [2003] [2004] (See also SocialNetworkAnalysis)

RichardFlorida finds voters clustering into politicised cities : (See also CreativeClass)

This quote from Florida just struck me :

For much of the last century, the nation's politics has been dominated by geographic splits – North and South, rural and urban. Now, society is changing at a more molecular level. City by city, even neighborhood by neighborhood, our politics are becoming more concentrated and, consequently, more polarized.

This is a SystemEvolvingTowardsMoreSmallerSpecialistComponents