(1) Chris Hayes: "It was always apparent who the [DNC folks] favored"
Where is he saying the primaries were rigged?
(It is in fact, quite hard to rig a primary. There are, however, any number of ways to fuck up a CAUCUS. I know this because I have personally run caucuses.)
And there's no question the DNC folks favored Hillary and pulled out every stop they could to help her. The leaked emails were real emails.
But also you can see this in the front-loading of the 2016 primary schedule and the scheduling of the debates (that there were so few of them). There were also any number of issues involving access to VoteBuilder (the DNC's voter-outreach database).