He has no chance of winning the nomination and the only reason he is in the game is to raise his profile and be the running mate. That is how the establishment RINOs work. His attacks mean nothing. They will sing the line that we must put the hostilities behind us and it is now the time to unite. The establishment always wants one leftist and one alleged conservative on the ticket.
Everyone has their opinion. I know he is the ONLY one who attacked Mitt on Romneycare and his book.