Superdelegates are almost 20% of the vote in Democratic primary.
Underreported in the mainstream media is the significant role played by Democratic "superdelegates" in the primary process. 20% of the delegates at the convention are superdelegates. A list of these delegates along with their endorsements so far is HERE. Considering Clinton's large lead in the polls her clear superdelegate lead is also very significant. In fact one could argue that the superdelegate approach - by design - helps give a significant edge to political insiders like Hilary Clinton.