Black pols like being congress critters and other elected/appointed people in positions of power. They like the money/graft that comes with it and the possibilites of other perks.
They got elected by telling their constituents that all their problems are due to the actions of others i.e. racist cops/Evil Whitey instead of their own actions.
Grifters like Cummings are not now going to tell his constituents that they can improve their lives and their cities by working hard, staying out of trouble, not having babies at thirteen, not relying on Big Government, or by blaming others for their problems.
Not going to happen.