Harris is a terrible pick. She's from a state that democrats would still win if they ran a box of used tampons and Biden is actually more popular with black voters than she is.
Problem is they boxed themselves in with the "Has to be a black woman" nonsense. Live by identity politics, die by them as well.
Their base would vote for Trump out of spite if they didn't have a "BIPOC female" on the ticket.
What BIPOC really means is everything but white, but in a way that can't be objected to.