Hillary Clinton won the primaries by popular vote by 55% to 43%. If you want to point at some shitfuckery against Sanders, you first have to look at a mass media that has historically ignored the interests and issues of working class people, promoted people and opinions that would argue against any kind of large change, and given better coverage to non-leftist candidates, because the owners to that media want it to defend their own interests, not serve as neutral vehicles of discussions in a democratic society.