I am thinking of that incident and there's a lot going on in that one. You can see Bernie supporters getting blamed here, though:
http://www.msnbc.com/msnbc/sanders-supporters-divided-trump-...
The caucuses were heavily skewed in Sanders's favor. Caucusing requires a large time commitment, which favored Sanders supporters over the poor minority Clinton voters. You're probably thinking about the Nevada Convention, which I explained in my previous comment.
> I wasn't personally paying much attention yet, as I'd already assumed Clinton had the nomination in the bag.
She certainly had it in the bag, which makes the claim that she would resort to rigging the primaries even more ludicrous. She got almost 30% more of the popular vote than Sanders. Despite the media wanting to make the race seem close and interesting, it was obvious to even a casual observer like you that it was a landslide.
> You can see Bernie supporters getting blamed here, though:
The people quoted in that article are actual Bernie supporters.
> There was also that time when they staged violence at the Trump rallies and blamed it on Bernie supporters.
The DNC did not stage violence at Trump rallies and blame it on Bernie supporters. You're probably thinking about http://www.cnn.com/2016/10/18/politics/project-veritas-actio..., who incited Trump supporters to violence, which is different from pretending to be a violent Sanders supporter. Zulema Rodriguez also had nothing to do with "rigging the primaries."