As they showed in '74 when they almost ran the GOP out of DC, they don't need a plan only a target that has lost public sympathy. Nixon lost that for the GOP in Watergate and all things Republican were anathema. The hatred for Bush makes the feelings against Nixon appear to be a minor disagreement. You convict Rove or Libby or both and you will see a replay of '74's elections whether the Dems have a plan or not. As for being the party of rapists etc., if the final legal judgement is 'not guilty' the truth of the matter means little. If the final verdict for Rove et. al. is 'guilty', the court of public opinion won't care about the truth.
I have to chuckle about that now. Sure the libs succeeded at the time at making republicans radioactive, but even then, in the '76 presidential election, Carter only managed to barely win over the bumbling Ford, only to be plagued by a TRULY crumbling presidency, opening the doors for Reagan to swoop in. Even a few liberals I know wish Ford had won instead of Carter, believing it would have prevented a Reagan Revolution. The dems should be careful what THEY wish for, yes history could repeat itself again--only not in the way they hoped.