Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Superdelegate" Definition
noun
An elected official or political party leader who attends a presidential nominating convention and who may or may not have made a commitment to vote for a candidate.
Source: American Heritage Dictionary
A member of the democratic party who has been selected to attend the national convention to help select a nominee for president.
Source: Wiktionary
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