D.C. is a heavily democrat city, as evidenced by the high levels of educated people.
But what about the crime rate and the poverty levels? As well as those in New York, New Jersey, Oakland, Chicago, Detroit, Los Angeles, Dallas, New Orleans, Atlanta, etc. etc.
In an earlier thread, you asked about this, and I answered by providing a long list of low crime, high standard of living cities that were primarily democratic. Of course you ignored it.