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UNITED STATES - May 15: Sen. John McCain, R-AZ., and Sen. Tom Coburn, R-OK., walk to the U.S. Capitol from the Senate subway on May 15, 2013. (Photo By Douglas Graham/CQ Roll Call)

UNITED STATES - May 15: Sen. John McCain, R-AZ., and Sen. Tom Coburn, R-OK., walk to the U.S. Capitol from the Senate subway on May 15, 2013. (Photo By Douglas Graham/CQ Roll Call)

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