I built in a elasticity to the non-White vote into my model, operating under the assumption that non-Whites in more Republican areas will be more inclined to support the GOP.
Do we have any empirical evidence for this? It seems reasonable to make this assumption for Asians and Hispanics, but my guess would be that Blacks vote pretty uniformly everywhere in the country.
That's what I think. When you look at exit polls, you will see that Blacks voted like 88-91% in most states for Hillary (7-10% for Trump). On the other hand, Latinos and Asians' results varied a bit more depending on which state they lived.