Not to protect him for indictment, Son, but to protect everyone else from indictments. If Bernie wins the nomination and then loses to Trump, its game over.  As PGL noted... they need a ticket with Biden and someone who can take over from Biden when he is incapacitated from slipping on a banana peel someone carelessly dropped at the top of the White House stairs causing an unfortunate fall.  Actually, it will be very interesting to see who is the Dem ticket Vice President.  That will be a real clue at to the future direction of the Democrat party.