So you're saying that somehow the DNC generated 3.7 million more votes for Clinton than Sanders?
I have some distant cousins who are huge Sanders supporters, so I can comment on this. Basically the really hardcore supporters are claiming that votes for Sanders were either not counted at all or given to Clinton instead. Depends on who is telling this conspiracy theory which one they go with. And yes, they do truly believe that they had the votes to win every state (or almost every state) and the DNC was conspiring against them to steal the primary for Hillary. And this was all what they were saying before the Wikileaks event.