1. Nothing spoken of in this thread speaks to anything having been "rigged." The rules in place are clear to all parties, and have not been violated in fact or in spirit.
2. Sanders is disproportionately benefiting from the "un-democratic" aspects of the system. This one caucus is practically the only one to go against Bernie slightly, while all the others have benefited his delegate gains substantially. Caucuses themselves are supremely unrepresentative of the population and are disproportionately driven by activists and passionate supporters. This is justifiable in that this is a political party's primary system and not a real government election. But again, they overwhelmingly benefit Sanders so it is ludicrous to criticize it when a single one, in basically the smallest state in the country, doesn't go thoroughly in his favor.
3. Superdelegates are not presently doing anything against the will of the people. They are following the rules. And besides, the only theoretically credible strategy the Sanders campaign is making for being able to win the Primaries is that they are going to override the will of the voters and convince the Superdelegates to support Sanders over Hillary.
4. Joe Scarborough is, at best, a conservative Republican trying to divide and conquer, and, at worst, a know-nothing. He is not someone your source should be citing. The Democratic primaries are considerably more democratic than the Republican ones, if only by virtue of being almost entirely proportional rather than having numerous large winner-take-all states. By this same token, the Democrats' primaries are in many ways more open and democratic than the actual Electoral College, but that's another story entirely.