Does the president's party usually gain or lose seats at the midterm elections?

John Dickerson discusses how the sitting president's party typically performs in midterm election years. John Dickerson is co-host of CBS This Morning. He was previously CBS News' Chief Washington Correspondent, Political Director and anchor of Face The Nation. Dickerson is also a contributor to Slate's Political Gabfest and to The Atlantic. During the 2016 presidential campaign, Dickerson moderat

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