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UNITED STATES - July 18: Sen. Carl Levin, D-MI., and Sen. Claire McCaskill, D-MO., talk as they make there way to the Senate policy luncheons through the Senate subway in the U.S. Capitol on July 18, 2013. (Photo By Douglas Graham/CQ Roll Call)

UNITED STATES - July 18: Sen. Carl Levin, D-MI., and Sen. Claire McCaskill, D-MO., talk as they make there way to the Senate policy luncheons through the Senate subway in the U.S. Capitol on July 18, 2013. (Photo By Douglas Graham/CQ Roll Call)

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