They also did pretty much the same with Clinton, he was unknown ot most people at the time he won the nomination. I guess being unknown and a convincing liar is their ideal candidate.
It would also be a plus if he no qualms about making deals with Chinese quasi government corporations to trade favors for campaign cash.
He also should consider citizenship (or lack there of) as no impediment to voting in national elections.
These are just a few of the qualities that the Dims should be looking for in their next Presidential candidate.