While these numbers will not be reported in this fashion they are certainly matters of open knowledge among professional politicians. If you are a Democrat politician with few or no African-Americans in your district you are facing an election in which you must run away from the titular head of your party who has support of only one in three voters. If you're a Democrat politician in a black district, you have more options but your district was never really in play anyway.
These more subtle realities explain why reports are leaking out from many left-wing sources that the Democrat party is disintegrating into panic mode.
It is a fascinating speculation to put oneself in the shoes of some of these Democrats who might be ideologues but who are careerists first. Under these circumstances they would normally triangulate and vear away from the party line. But this season the atmosphere in the Democrat party is different than it's ever been in my lifetime. I suppose there is real fear among run-of-the-mill Democrats about the power extrinsic agents like George Soros and his 527s, fortified by immense amounts of money, have to destroy maverick Democrats who go off the reservation in order to save themselves. These careerists are put in a real dilemma. If they follow Obama, Pelosi, and Reid they know they will go over the cliff. If they buck the likes of Soros and his sinister apparatus, he is likely to knife them from behind and he has the power and the money to do it. Oh, the humanity!
the danger is that the Left may conclude that if his administration is imploding anyhow, they may as well cram through as much Socialist crap and loot as much cash for their supporters as possible in whatever time is left