pledged delegate

基本解释

In the delegate count estimated by CNN he leads by around 120 if you count only pledged delegates and over 40 if you include “superdelegates” (bigwigs with ex officio vote at the convention).
根據CNN預測的情況來看，奧巴馬承諾代表中的領先優勢在120蓆左右，如果包括依職權在大選中投票的“超級代表”則優勢減少到40蓆。

But I will say that it was really cool to be able to go into the voting booth on April 24, 2012 and see my name on the screen as a pledged delegate in support of President Obama.
FORBES: The Kids In The (Convention) Hall: A Millennial Perspective On The DNC
Clinton will argue the opposite case, of course, and will say, look, superdelegates have been given the power to follow their own conscience, and here is the reason they should follow their conscience and not follow the pledged delegate lead that Obama has.
NPR: Clinton Lagging in Fundraising

(in the US)a delegate at a national party convention who is mandated to vote for a particular candidate