She really strikes me as the type who feels "I'm in the ruling class. I don't have to follow the rules the rest of you do."
There's an old saying that politicians generally come across as they really are.
I had a med school prof who was Gore's physician for a few years and traveled the world with them in the late 90s. He said that everything you would think is true via TV and the way they come across basically was. Bill Clinton was a gregarious, fun-loving and calm guy, a sort of mature party animal kind. Tipper Gore was sweet as punch. Otoh, Hillary was every bit the five-letter B word you'd think and Al Gore was an arrogant little you know.
He literally said you saw them and figured Bill and Tipper belonged together and Al and Hillary would have made a great "War of the Roses" couple. The movie, not the fifteenth century English wars.
I also had a friend with the police that provided security in Little Rock for the Clintons and her "rules don't apply to me" personality was known even back then. There IS a reason she's called "Lady Macbeth of Little Rock." I'll tell you who she reminds me of - Jesse Jackson in the late 1980s. Not in terms of flowery preacher rhetoric but in terms of coming across as, "You're lucky to have me, and I should be the king (queen) of this country and you should vote for me BECAUSE I'M ENTITLED to it. And if you don't you're a racist (sexist)."
Sanders is connecting with that desire for authenticity; for better or worse, so is Trump. You know what would REALLY shake up the system? If these two won their party's nominations and then after the Conventions cut themselves loose late enough that the parties couldn't get anyone on the ballot. Remember, it's the two parties in general that have rigged the game so that it's impossible to get names on a ballot. Simply announce say after Labor Day that you're no longer the party nominee.
This would be incredibly easy for Trump because of his money, probably not so much for Sanders (but maybe - if he can raise Obama-style money).
It's not that I want either guy and I'm sure the parties have thought in advance about how to change the rules to their own benefit - but it might be just the kind of wake-up call the whole country needs.
(I'm not trying to be rude or morbid, but I half expect Sanders to get the nomination in the bag and then croak next summer and Hillary come to the rescue as the back-up nominee).