Why is the Speaker of the House second in succession to the President?

John Dickerson introduces us to the 25th Amendment and explains why the Speaker of the House is second in succession to the President after the Vice President. 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. D

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