I think it has to do with gangs and and high rate of drug addiction in this area. I live in the Pacific NW where heroin/meth is running rampant and homelessness is everywhere. The city just looks trashed now.
How come that the entire political scene on all levels collapses into just two poles, with the predictable result that many places are de facto one party places?
Why doesn't America have local Ross Perots in various corners of the country, starting their own political parties specific for one place only?
In a multiparty system, it is much more normal to be a swing voter.