I don't think they can cut their losses and run.
Through their own allegiance to political correctness they cannot ask an AFRICAN-AMERCAN to resign! The only, and I mean only way they can do that is if Obama volunteers to resign.
However, if he refuses, what are they going to do? Moreover, what if he announces it? What if he tells his fanatic followers that certain senior democrats asked him to resign but he is not because he's fighting for THEM (his followers) and this is just another example of the Man sticking it to the brother!!!!
In fact, that is the tactic they used ON the Clintons (that campaign was not just Hillary, as Bill was maybe not running her campaign but he surely ran his mouth).
No, the dems have areal dilemma on their hands and theirs no good way out. The resign issue ala Nixon will not work. Barry is no Dick*, he won't do the graceful thing and resign.
If I was a conspiracy nut I would even worry that they'll (the powers that be) use some whacked out lunatic, give him a TEA party background, and then have him put a cap in the One.
* Well, he is but I hope you knew I meant Dick Nixon!