Round up the usual explanation: Racists.
Up close, the guy is just plain unlikeable. Supercilious, with a stare that looks through rather than at people, and what is pretty obvious, totally unable to engage in a give-and-take conversation. If it is not scripted, he cannot even focus his thoughts enough to provide an honest debate.
But Harry Reid thinks the Current Occupant is “clean...articulate...light-skinned and no Negro dialect”.
Of course there is “no Negro dialect”. We have been advised that the Current Occupant is “not authentic or down for the struggle”, this from Al Sharpton, a true authority on the matter.