I think Moyers has hit upon the reason that the GOP is so effective at courting voters that will enable a party to go ahead with policies that are directly against their own best interests. They have masterfully been playing the public for suckers for years now and sadly I don't see it coming to an end anytime soon because of the diabolical plan to keep dumbing down America.
This is the old "Divide and Conquer" working like a charm, as it has for a couple thousand years at least. So poor and middle class whites have more in common with poor and middle class persons of color, with economic issues more than anything. But they get played with the Race Card, and fall for it. Decades of this has them predisposed to believe that the system is set up to help minorities with entitlements, etc. So they vote against their own economic self-interest due to resentment over this. Played to perfection.