Meet The YouTube Stars Who Asked Questions In Sunday's Democratic Debate

These four YouTube stars are helping NBC's moderators in tonight's Democratic presidential debate.

If you tuned into the fourth debate among Democratic presidential candidates on Sunday night, you may have noticed a few new faces. And it's no coincidence that they're as young, fresh and enthusiastic as they are: This time around, YouTube, the co-host of the debate, is letting four of the channel's popular creators ask pre-recorded questions during the debate between Hillary Clinton, Bernie Sanders and Martin O'Malley. But just who are these lucky YouTubers turned political debate moderators?

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