They’d lose a third of their guaranteed voters for decades to come if they dumped the first black president - even ‘rats aren’t that dumb...probably......
Perhaps you’ve left the commie media out of your consideration. With the media so solidly working for the DNC, the DNC backers (read new world order financiers) can remove little barry bastard commie by using the birther issue or some other issue and the media will dutifully blame it on the Republicans, upping the black turnout rather than reducing it.