Fresh swarm of superdelegates about to arrive

[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/05/01/art.convention.gi.jpg caption="Expect more superdelegates to come."]WASHINGTON (CNN) - Get ready for a deluge of new superdelegates.

All superdelegates -– elected officials and Democratic National Committee members -– are not bound by their states’ results, and can vote for the candidate they choose. Both candidates are fighting just as hard for their support as they are for the votes of the people in the upcoming primary states.

But some superdelegates are unpledged add-ons - individuals selected by each state’s Democratic Party. They are elected at state party conventions, executive committee meetings or delegate meetings, depending on the state. A wave of those events are scheduled for the next few weeks, as states finalize their delegate slates.

Unpledged add-ons can be called superdelegates because they both have the same voting rights - the only difference is that superdelegates are selected before the primaries and caucuses, while unpledged add-ons are selected after the state has voted.

Some of these add-ons pledged their support for candidates before they were elected. Of those elected so far, Obama has officially earned six unpledged add-on votes, while Clinton has earned seven.

In total, there will be 76 unpledged add-on delegates. CNN is keeping track of these delegates, but will only add them to the official delegate after they are officially elected at their states’ meetings. As of today, 13 states have chosen their unpledged add-ons, with the results of today’s Maryland selection still pending.