President Joe Biden’s campaign is tapping a veteran of Jon Stewart’s old show and a top aide from a progressive stalwart in the latest move to build out its national staff.

The reelection campaign is set to announce on Saturday two new hires, one to its research and one to its communications teams.

Andy Crystal, who previously led research at The Problem with Jon Stewart and Patriot Act with Hasan Minhaj, will be the campaign’s........

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