From The Guardian:
The tension between the projection of a modern, inclusive, tolerant party and the reality of a sizeable racially intolerant element within its base pining for the restoration of white privilege is neither new nor accidental. Indeed, it in no small part explains the trajectory of the Republican party for almost the last??half century. In his diary, Richard Nixon's chief-of-staff, Bob Haldeman, described how his boss spelled out the racial contours of a new electoral game-plan to win southern and suburban whites over to the Republican party in the wake of the civil rights era. "You have to face the fact that the whole problem is really the blacks," Nixon told him. "The key is to devise a system that recognises that while not appearing to."
This could be the final hurrah for what became known as Nixon's southern strategy in what is shaping up to be the most racially polarised election ever. Black support for the Republican party literally cannot get any lower.