Historically, Black women vote 95-98% Democrat and Black Men vote 80-85% Democrat.   Since Black women vote more than Black Men, this gives Democrats about 93-95% of the vote.  

When Black Women start voting differently, then there is a problem.  Until then, noting has changed - and no pollster is going to convince me that a Black Women running for office is going to get less than 95% of the Black Women vote.