They always do sanity, and even if Mr Sanders is elected President he will face opposition from many ambitious members of his own party, who will curry favour with the media.

If elected Mr Sanders has an almost impossible job on his hands, he is a gift to "Big Business" and his policies will be turned into a running joke, just as the opposition parties do to Mr Corbyn in the UK.
The only reason Mr Corbyn has not been removed "to make Labour more electable" is the mandate given to him by a few hundred thousand committed people who voted for him in the leadership election.

You will find that most of Mr Sanders most dangerous enemies will be standing behind him.