This schism between the suburbs and the urban core began in California, where Republicans perpetually win state elections on the strength of the suburban vote, despite well-entrenched liberal strongholds in Los Angeles and San Francisco.
The burghers of suburbia are stuck on the idea of government spending as a burden on honest people, and on the image of urban dwellers as welfare cheats, overpaid bureaucrats, and members of a condescending cultural elite. And they're looking for revenge.