Why does anyone live anywhere except the best possible place for them? Because it's cheaper. If no-one wanted to live in exurbs, prices on exurban property would decrease until some would.
But then why don't more liberal middle class people move there? For example take Richfield and Fridley. Both are bland middle class suburbs very close to the city. Both tend to be pretty Democratic. Yet they have similar incomes and demographics to most of Michele Bachmann's district. There's really only one difference: The houses in them are much smaller.
Why does anyone care who lives where?
You are aware of the very purpose of this site right?
Well, I know I didn't sign up here to read your rants about exurbs and suburbs. That's for sure.