Sanders did well with Northern Black Youth and west Mid Western Blacks. There's this persistent Myth that Blacks somehow despised Sanders, when he somehow has an 83% rating among us.
it was mostly Establishment and OLDER Blacks who saw the Clintons as more beneficial than Sanders.
To no fault of their own, until Democrats started attacking Sanders for having the Audacity to run.
But now that the Primary and Elections are over, older blacks and non establishment types accept the man, and also accept Progressive ideals.