I had no idea, until I read this. I worked very hard to check it out, but can only make partial correlations. The Media does not want anybody to be able to wade through the weeds on this.
The Democrat party is shrinking, in some places by a lot. This could bode ill for them, (and well for the country) come November.
The Breitbart article is here. Treat it as opinion, and make up your own mind.