To Democrats, staying in power is life itself. If they think they can't hold a seat, they'll force an incumbent into retirement to exchange new lies for old.
I think this is the beginning of what could be the resurrection of the democrat party. Their normal behavior would be to circle the wagons and defend Obama to their last breath. In this case, I think they will tell him it is time to go. The media may even turn on him.
Obama has been so bad, democrats will lose elections as "the party of Obama" for a generation unless they do something. And that was before he has been demonstrated to be lying about where he was born (either then or now). This event is what the democrats need to bail themselves out. I can even imagine them initiating impeachment. Obama goes away (or is sent away) and they get reinvigorated with a new candidate. Hillary??