The problem with Lee is that, aside from a million Californians, no one has ever heard of her, much less know anything about her record.
If you want to be elected, you need name recognition, not some anonymous ideologue that has no record whatsoever. Lee may be ideologically in the right place (and I’m not sure of that), but she is a nonentity.
Sort of reminds me if Sarah Palin – everyone said “who the hell is she?”. And she had been a governor.
If Sanders wants to be elected, he needs to run with someone that people have heard of. Otherwise it’s a waste of a good candidacy.