Bernie Sanders is correct both that the 2016 Democratic presidential nomination was rigged against him and that the chief culprit is Democratic National Committee Chairwoman Debbie Wasserman Schultz.
It goes far beyond the super delegate party regulars who support her almost unanimously and now make up most of her delegate lead. It goes beyond the near-riot at the Nevada state Democratic convention or even the closed nominating contests that favored Clinton even when the voters didn't.
Party chairs are supposed to remain neutral in presidential races, but Wasserman Schultz, who served as co-chair of Hillary Clinton's campaign in 2008, has not been neutral at all.
She sharply limited the number of debates and scheduled them for times when few were likely to watch, such as Saturday nights, to limit Clinton's exposure to attacks and deny her opponents name recognition. She entered into a joint fundraising agreement with the Clinton campaign in August 2015, then shut off Sanders' access to the party voter database last December, with the first primaries and caucuses just a few weeks out.