I'm not at all. throwaway123156 put it well above, but there is not, in my mind, corruption. The Democratic party is a private group that defines it's own rules, including how a candidate is selected. (The same is true for the Republican party - see how primary votes per state are allocated differently between the two parties). The Democrats had a rule that allowed _actual_ members to have an increased count in their vote (superdelegates).

Additionally, Bernie was _not_ a member of the Democratic party - he was an independent caucusing with the Democrats who chose to run as a Democrat. There a lots of good reasons for party members to not back a candidate who chose not to be a member and buy into their ideals until it was (potentially) advantageous for him to run as president.