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About 4,800 people determine the Democratic nominee for president. But most of them, called pledged delegates, are bound by primary election results — and that's why we know 55 percent of them will vote for Hillary Clinton at the Democratic National Convention, where the nominee is chosen.

Then there are superdelegates.

It's a group of 719 party leaders who can vote for whomever they want, and change their minds whenever they want.

But Clinton has such a large lead over Bernie Sanders in pledged delegates that, even if hundreds of superdelegates change their minds, Clinton would still win the nomination. So in this sense, superdelegates didn't make much of a difference in this election.

But superdelegates can influence the election in other ways, most notably through sharing their preference in the media. Occasionally, media organizations like the Associated Press call all 719 superdelegates to see who they prefer. And that's how we know the large majority of them supported Clinton over Bernie Sanders, even before a single vote was cast.

The primary process is long and arduous, with twists and turns that can change the tide of an election. But having the first say, if even through the media, gives superdelegates the ability to set expectations for candidates. If we think winning the Iowa caucuses or New Hampshire primaries are important, so is winning the public support of superdelegates early on.

For Sanders supporters, that is a legitimate complaint.

The other legitimate complaint is that the average superdelegates is about 60 years old, according a Pew Research Center analysis. Exit polls consistently showed younger voters supporting Sanders by huge margins, while older voters preferred Clinton. So the older demographics of superdelegates may have favored Clinton. That said, it's not a surprise that the average age of superdelegates is about 60, since older party leaders are more likely to be established statesmen who earn a spot on the Democratic National Committee.

So who are these 719 people who have outsized power in this process? I initially posted a list a few months ago, which was accurate as of January 21, 2016. The list below, which I also got from the Democratic National Committee, is accurate as of May 27, 2016. About 20 names have been removed, and another 20 added. Here's the list: