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UNITED STATES - July 18: Senators Sherrod Brown, D-OH., Tammy Baldwin, D-WI., Carl Levin, D-MI., and Claire McCaskill, D-MO., make his their 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: Senators Sherrod Brown, D-OH., Tammy Baldwin, D-WI., Carl Levin, D-MI., and Claire McCaskill, D-MO., make his their 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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