If Sanders won the Democratic nomination, he would win black votes overwhelmingly in the general election. Blacks are the Dems most loyal voting block. The Dems know they can take black voters for granted anyway.
I have been saying for some time now that Sanders should pick black Congresswoman Donna Edwards for VP.
Everyone knows he would win blacks if he was the nominee. And Edwards is already running for the open Maryland Senate seat, so she'll be in the middle of that race when it comes time to pick a VP.
But in many states you can run for both.