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UNITED STATES - MAY 18: Presidential candidate Sen. Rand Paul, R-Ky., tours Independence Hall in Philadelphia on Monday, May, 18, 2015. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - MAY 18: Presidential candidate Sen. Rand Paul, R-Ky., tours Independence Hall in Philadelphia on Monday, May, 18, 2015. (Photo By Bill Clark/CQ Roll Call)

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