It must have been those race-baiting Kerry ads that were so insulting to the intelligence of black people.
It is insulting in a way since the implication is that "all you African-Americans have been taken for granted by the Democrats." It could make you defensive and angry at the Republicans.
But it could make you just plain angry that you've voted Democrat all your life and (on the local level) the Democrat has always won, but the educational system is far worse now than when you were a kid.
Sooner or later, you have to ask yourself whether the Democrats are the solution or the problem.