EXCEPT:
2008: Fully 96 percent of black voters supported Obama and constituted 13 percent of the electorate, a 2-percentage-point rise in their national turnout. As in past years, black women turned out at a higher rate than black men.
2012 Black vote: Obama 93%, Romney 6%; 1% Others. A little bit better than McCain ,but still VERY monolithic...
The good news is there is no way Hillary will get the same numbers. If Trump wins the nomination, a lot more Blacks will vote for him than have voted for a Republican in the past many elections.
2008 and 2012 you had the 1st Black Presidential Candidate nominated by either party. Bit different now.