I strongly dislike both as candidates... but if it's the only way folks can get them to stop running for office (lol) and their diametrically opposed constituencies can cast votes in the same direction, volunteer for one another, and beat 45, then whatever.

Bernie can be Biden's "left" ear. Biden can try translating some of the far-lefts demands into establishment-ese to foster compromise in Congress. Bernie would have a lot of leverage as VP/Senate Pres.

It might just work.