There are 4051 Democrat delegates, and 712 of those are superdelegates (or, those who are unpledged/unbound to any specific candidate, and who can vote for whoever they want, no matter what their home state popular vote says.) Those superdelegates include:
1. All Democrat governors
2. All Democrat senators
3. All Democrat congressional representatives
4. Some Democrat big city mayors and state lawmakers
5. All former Democrat presidents, vice presidents, US Senate leaders, and speakers of the House
6. President Obama
7. All members of the DNC.
Republicans have 2472 delegates, 168 of which are superdelegates, and those 168 people are RNC members. However, they are NOT allowed to vote for whoever they want at the convention. They can only support whoever their state supports, which means that they’re really not “super” at all. They’re just delegates