Sanders on his best day is a fool. He runs within the Dem Party knowing they will undercut him. It is no mystery here, and yet he does it any way. His followers will do nothing, and yes, some will not vote, some will vote for Trump, and some will stay home. It's called FREEDOM to vote as you wish, or not. As it is, only about 65% of America votes. So the Bernie followers have plenty of company.