scandal plagued democrats should not run for re-election

We need party leadership to encourage and demand if necessary that Democrats with scandals should step aside.
That means:

Charlie Rangel
Chris Dodd

Learn the lesson of Jon Corzine and William Jefferson.
Even if you didn't do anything wrong like:

Harry Reid
Roland Burris

For the sake of the agenda you support step aside for the next election.
Focus on what you can get done between now and the end of this Congressional session.

Imagine having a party dedicated more to ideas and ideals rather than personality.

When you have to use so much energy just to get to even, that effort could be better used to help the nation.