President-elect Donald Trump, left, and Vice President-elect Mike Pence acknowledge the crowd during the first stop of his post-election tour, in Cincinnati on Dec. 1, 2016. A new CNN Films documentary explores the role of the U.S. vice presidency, which in modern times has emerged into a more powerful position. Still, the film notes that a veep’s duties are all up to the president. (AP Photo/John Minchillo) **FILE**
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