Out for himself or principle? Maybe his thought is that the Ds are too dirty by compromise and wants to bring them back to their ideals in the way some in the tea party do with the Rs. Could be that Sanders could be the start of a very vocal internal movement within the Democratic party. Pull left or we will hurt your chances type thing. Kind of like the tea party hardliners

 

As much as people want to claim Democrats are far left liberals, the Democratic party has never been close to what Bernie Sanders is. His ideals are not the ideals of the Democratic party. I agree with you on the last part about Sanders perhaps starting an internal tea party like movement only from the left side. I think that is what he wants. But when he claims the system is rigged, etc. he is only creating damage with nothing good coming from it - except for Republicans and Trump.

Nate Silver on Twitter: "The system is rigged in favor of the candidate who's won 3 million more votes. Unbelievable. https://t.co/TqMXrY3rw