
A `superdelegate` is a delegate to the Democratic National Convention or Republican National Convention that is seated automatically, based on their status as current (Republican and Democratic) or former (Democratic only) party leader or elected official. Others superdelegates are chosen during the primary season. All the superdelegates are fre.....
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http://en.wikipedia.org/wiki/Superdelegate

(from the article `Democratic Party`) ...holds its convention second. The Democratic National Convention is typically attended by some 4,000 delegates, most of whom are selected during ... ...least 15 percent of the popular vote. It thus takes Democratic candidates longer than Republican candidates to amass the required majority. In ......
Found on
http://www.britannica.com/eb/a-z/s/187

a party leader or elected public official chosen as an uncommitted delegate to a national political convention.
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https://www.infoplease.com/dictionary/superdelegate
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