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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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Christine Pelosi, a DNC member from California who backed Clinton but supports scrapping superdelegates, recalled media coverage of Sanders’ big victory in the New Hampshire primary being colored by Clinton having unpledged delegate support in the state.

From The Guardian

NBC News, the Associated Press and other media organizations named Clinton as the presumptive nominee based on both her pledged and unpledged delegate counts.

From MSNBC

If you include Mr. Trump’s preferred delegates from the unpledged delegate slate in Pennsylvania, he is around 250 delegates short of the 1,237 necessary to win the nomination.

From New York Times

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

From Time Magazine Archive