STL region:
http://www.stltoday.com/news/local/govt-and-politics/st-louis-region-reflects-the-increased-polarization-in-the-u/article_f64720f0-c711-5964-bb61-72a287108712.html
...they kind of beat around the issue with certain districts with majority white voters turning Republican: The democrats have become the explicitly anti-white party, they made a bet on the changing demographics. It may help them in the long run but is causing them problems now.