Why Isn't This Offensive?

Why do blacks not take offense at Democrats minimizing the horror of slavery through the use of absurd analogies?

According to the New York Times, Hilary Clinton equated Senate Democrats to slaves and the Republican-controlled Congress to a plantation. This strikes me as extremely offensive on many levels.

Democrats are a minority only because they have not won elections. That's very different from pure bigotry and hatred targetted toward someone of a different color. It's absurd for the rich, white, privileged and powerful to portray themselves as victims. To equate the Democrats' legislative and electoral incompetence with the sufferings of slavery is to minimize the very real horrors of slavery. It is almost to fictionalize it.

Holocaust survivors are relentlessly vigilant about analogies that minimize the real evil of Hitler's final solution. Why do blacks not react the same way to such stupid statements as Hilary's? Why, instead of recognizing this for the insult it is, do they rush to her defense?

When Bill Clinton declared himself "the first black President" because he came from a broken home, why did they embrace him rather than see this as continuing a stereotype about black families?