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UNITED STATES - MAY 14: Sens. John McCain, R-Ariz., left, and Richard Burr, R-N.C., make their way through the basement of the Capitol en route to a vote in the Senate, May 14, 2014. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - MAY 14: Sens. John McCain, R-Ariz., left, and Richard Burr, R-N.C., make their way through the basement of the Capitol en route to a vote in the Senate, May 14, 2014. (Photo By Tom Williams/CQ Roll Call)

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