This is what happened, or at least what I've heard happened:
Time Warner owns CNN and gave 500k donations to Hilary.
CNN does the democratic debate, lets Hilary talk the most. She is never interrupted.
They do a live Facebook poll asking "Who is winning the debate?", in which Bernie Sanders ends up with 80% of the vote. CNN only televises this result ONCE.
Then, they go ahead and declare that Hilary won. They do another poll that includes people who did not watch the debate, just the highlights. In which Bernie's best moments are missed.
Comments supporting Sanders were removed, people are outraged.
You don't have to like Bernie Sanders, but at least help expose CNN. You can't trust the media these days. #FeelTheBern