How are they suppose to do that?
If they find a candidate who will "do the right thing" he certainly won't be a Liberal.
The fact is, the Democratic Liberals have no one in their party who can appeal to main stream conservative values. All they can do is run a "ringer" and hope he wins.
Either that, or what I think they will do: just get another Ross Perot to run some cockamamie 3rd-party from the right, and they get to go on, business as usual, and revert to their tried/true methods -- demagoguery, class warfare, race-baiting and lies, preaching to their university-dominated choir. It's obvious; by doing that one thing (egging on a third party), they could avoid doing the unthinkable: getting an actual platform...