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The GOP’s most likely threat to Hillary

Now that Gov. Chris Christie’s out of the running, this Republican looks a lot more viable.

Rep. Paul Ryan (R-Wis.) on Capitol Hill in Washington, Dec. 11, 2013.
Rep. Paul Ryan (R-WI) on Capitol Hill in Washington, Dec. 11, 2013.GABRIELLA DEMCZUK/The New York T

Jane Timm