My guess is they'll just stop defending him and let nature take its course...with a just little helpful and timely "guidance" to make sure of the desired outcome and that the "correct" understanding is a part of the official narrative once the dust settles and the crisis has been taken advantage of.
Plenty of blackmail, motives, reasons and potential suspects to make literally anything happen, especially at the level obama is playing.
For his sake and ours, I hope it's not tragic. For example, Farrakhan's comments these last few have been more than a little chilling and he's just one of many.
Your scenario is realistic, and could well happen. But what do you think of this one. The top Dem strategists select the single most damaging piece of evidence they have against Obama [such as, for instance, that he applied to Occidental as a citizen of Kenya] and leak it anonymously to Breitbart. Thus the dirty work gets gone by a ‘rightwinger’, and the Dems’ hands are clean. If that doesn’t work, rinse and repeat.
Seems like a method that would lose them the fewest black votes. Plus, what Dem wouldn’t want to campaign against the evil Breitbart? Win win, it seems to me.