Bernie Sanders is corrupt, a hypocrite and has run a hate fueled campaing:

https://www.washingtonpost.com/opinions/bernie-sanders-is-no-revolutionary/2016/02/08/19a15618-cea3-11e5-88cd-753e80cd29ad_print.html

“Since he arrived in the Senate in 2007 and continuing through last summer, Sanders has regularly hosted the DSCC’s retreats on Martha’s Vineyard and in Palm Beach, Fla., for wealthy donors (including lobbyists). Sanders also allowed the committee to do a direct-mail piece signed by him, and his campaign has a joint fundraising agreement with the Democratic National Committee, just like Clinton’s.

Sanders has often boasted that he doesn’t have a super PAC. But, as The Post’s Matea Gold has noted, an ad hoc network working to elect Sanders “is also employing professional political tactics, such as the use of entities that can raise and spend unlimited sums.””