Besides the two correct answers from Java and Crusader:

1. Primaries serve a private party function and can be run any way the party wants;

2. Superdelegates exist to counter the extremism of the party faithful;

There's a third point:

3. The superdelegate system was created, in part, to avoid floor fights at the convention by putting the nomination to a simple majority vote of delegates, ensuring a first-ballot victory for one candidate.

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