That’s 96% of ~15% of the population - a vote most sensible ‘Pubbies have already written off.
Blacks are just not that important electorally.
The reason ‘Pubbies write off the black vote, is that, normally, the Dems pick up ~85% with no effort on their part.
So we’re really only talking about a change of ~1.65% to the overall vote.
It’s 15% of the population, but it’s absolutely essential for many House seats for Democrats to retain that high % of the Black vote.
They could also be the deciding factor in many Governor races.
Because they vote almost 100% Democrats, you’re talking about 15% of the Democratic vote.
In close races, that could be the difference between a Repub and Dem winning.
That’s why Obama will never by primaried.