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unpledged delegate

British  

noun

  1. Also called: superdelegate.  (in the US)a delegate at a national party convention who is free to vote for any candidate

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Or he can be elected, as an unpledged delegate, by his colleagues on Capitol Hill.

From Time Magazine Archive