There's a reason for this..
With a few exceptions, most blacks that Democrats have put in office are there because they can be manipulated, and are already in positions way over their depth..
Dems have picked and placed these politicians for the most part.
Those black democrats that are critical thinkers have long ago bought into the practice of manipulating their own people.. good practice for manipulating a political party..
Now the Democratic Party is afraid to allow these intelligent free operators into prominent party positions.. where they could conceivably consolidate their power, combine with other black free-operator democrats, and eventually take over the Democratic Party...
The Democrats only hope at this point, is that Black Politicians with critical thinking skills, that cannot be manipulated, that refuse to be "tools" of the Liberal Party, will all become Conservatives, leaving the Democratic Party with a continuing weak-willed, easily directed black democratic membership..
The Democrats rely upon fear and ignorance to keep voters of all races within the party. Anyone who is capable of independent, logical, and rational thought becomes a Republican. The only ones that stay Democrat do so in order to be part of the party leadership and continue the cycle.