Bernie’s campaign made many mistakes. The biggest being while he knew the rules he forgot to tell his supporters what they were. Instead of blaming himself he now blames the Democratic Party for his mistakes. His own senior advisor helped create the superdelegate system. He knew which primaries were ‘open,’ where anyone can vote; or ‘closed’ where only registered Democrats can vote. He didn’t think it important to tell any of the people who came out to his rallies about that.