Al Sharpton has never won an election in his life, he got 1% in his presidential campaign and did extremely poorly in his mayoral races. Clearly most black voters weren't (and still aren't) flocking to his message. Wright has never run as a candidate and would almost certainly be unelectable even if he ran in a 100% black district. However, if you subsituted those names for black politicians who have SUCCESSFULLY won office, like Barack Obama and Deval Patrick, then yes, I would argue MOST black Americans agree with their message and would tell you that Obama and Patrick represent their values.
The NJDC is chaired by Senator Ben Cardin and Senator Ron Wyden. Do I believe that MOST Jewish Americans agree with their message and their values? Yes I do. I feel bad for the sane 20% that OPPOSE those beliefs but get smeared on the mistaken assumption that they agree with it, but I don't pretend the other 80% of Jewish americans disagree with the NJDC.
If you stopped the "average" Jewish voter on the street and asked them if they agree with so-and-so statement that Ben Cardin made, they would probably tell you they do. If you stopped the "average" black voter on the street and asked thme if they agree with so-and-so statement that Obama made, they would tell you they do. To deny this is to deny reality in America today.