Definition of superdelegate
: a person who is chosen as a delegate to a political party's presidential nominating convention because of his or her status as a leader or official within the party and who is free to vote for any candidate regardless of the results of the popular vote in primary elections and caucuses preceding the convention Superdelegates were invented by the Democrats after the 1980 election in the expectation that in any future close nomination race, they would line up behind the establishment candidate and head off the possibility of a ruinous floor fight at the convention. — Matt Bai
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