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

---

Example Sentences

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

Larry Taylor, a superdelegate, told the crowd he would pledge his support for Sanders, adding that he had turned in his ballot two weeks ago: “I do not believe that my vote as an unpledged delegate should invalidate thousands of votes cast by Oregon Democrats.”

From The Guardian

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

Carlson is running as an unpledged delegate and says he would seek to ensure that only declared presidential candidates are considered for the nomination in Cleveland.

From Washington Post