@benfell I get the feeling that Sanders is the right person in the wrong party. He'd work better as a Green or independent but given the US political machine, he can't even think of running as a presidential candidate without big party backing.

I don't see him doing a Corbyn and having a parallel organization within the Democratic party either. There's still a lot of grassroots and door-to-door stuff that traditional parties are good at; not everything can be done online.