or really every year since jesse jackson ran.

black voters are increasing their share of the primary electorate each time out and expected to cast 1 of every 4 votes this year. and biden is dominant with this group.

in overwhelmingly white states...the crowd at the top of the field is usually pretty close among 2-4 candidates. with proportional delegate apportionment...they would all walk away with the same or similar amounts of delegates regardless of where they actually place. but in states with the largest black populations wherevbiden is beating everyone pretty handily...he can run up the score there.