Donkeys and superdelegates

I think a hilarious contradiction in the Democratic Party is often overlooked by most people. The superdelegate. The symbol of the democratic party is a donkey, supposed to represent the common man. But what I don't get is why only the democratic party has delegates that represent only their self-interests. Superdelegates are delegates that can vote at the democratic convention. They are in no way chosen by the people during the primaries, and most of them are governors, congressman, and other political power figures. They are not obligated to vote any particular way. The last time I checked Obama had quite a few more delegates than Hillary, but she had almost double the superdelegate count. That's what has kept them neck and neck for so long. If you ask me, that is not helping the hard-working common man at all. I suppose liberals would defend the superdelegates by saying that they usually vote similar to the people's wishes. They certainly don't have to vote according to the people's wishes. Ideally shouldn't the Democrats stand up for the common man and be the party without the superdelegates? Superdelegates undermine the definition of "Democratic".