RGV is just shifting right, no other explanations make sense. Not the end of the world. Better there than somewhere more vote rich.
What this post is actually saying: due to innumeracy, I have found a way to cope with the fact that my party is a loathed piece of excrement in every rural area where neither Blacks nor American Indians live.
Even Black/Native American rural areas are trending Republican, there are a lot of Obama 12-Trump 16-Trump 20 counties with large Black/Native American populations.