Why does Trump do better with Republicans that live in less white areas?

[Mr. Morden]

So, prejudice/racism is the answer? I thought that was more of a left wing smear than a legitimate answer, but I guess not.

Well:

The Civis Analytics polling over the past six months breaks down Trump support by Congressional district (yes, huge MoE, but it gives a rough idea), and there's overlap between where Trump is strongest in GOP primary support and where there's a disproportionately high share of "racially charged internet searches":



http://www.nytimes.com/2015/12/31/upshot/donald-trumps-strongest-supporters-a-certain-kind-of-democrat.html