I think this trend had been building up for awhile. That is why HRC couldn't win the nomnom in 2008. I was looking at some past election results and we picked Bush in 2000 because he was a relative outsider and the democrats chose to give us another Clinton-Democrat. In 2004 we were a huddled mass of fear that wanted Uncle Red State to protect us instead of the Vietnam Swift Boat captain, John Kerry. 2008, Obama was seen as an outsider that could straighten up the party and we rallied around him after being diddled by Uncle Red State from 2004-2008. 2012 we were happy with the Presidency and some progress, but fed up with the self-serving private interests rife in Congress pushing through the Democrat agenda, rather than the working classes, day after day... And here we are again, 2016 and we don't want the insider, we want the outsider that people foolishly believe can change the system.
Bernie was right about one thing, it has to come from the legislative branch, the Premiere Trump can't drain a bathtub by himself, much less a swamp.