Both the GOP and Dems have lazily accepted the state of the black vote as a fait accompli. The GOP has been too lazy to pursue it under the assumption it was going dem, and the dems have taken it for granted. Neither ever counted on the Trump Factor, in which somebody would actually work to earn their vote, and now they're both in a panic that the status quo may be changing.
Good analysis, Joe. You are exactly right. The conventional politicians have never encountered a person or force like Trump. He is shaking long-ossified things up from A to Z. He is a true change agent, somebody that happens exceedingly rarely.
The funny thing is the progs / Dems are always yammering about “Change” (c.f. Obama), but they never want to change government itself (except to make it bigger and more all-powerful). Trump is making it change and they hate it. They are hypocrites to the core.