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UNITED STATES - APRIL 15: Sen. Elizabeth Warren, D-Mass., speaks during the United Steelworkers rally in opposition to the proposed 'Fast Track' bill, or Trade Promotion Authority, in UpperSenate Park on Wednesday, April 15, 2015. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - APRIL 15: Sen. Elizabeth Warren, D-Mass., speaks during the United Steelworkers rally in opposition to the proposed 'Fast Track' bill, or Trade Promotion Authority, in UpperSenate Park on Wednesday, April 15, 2015. (Photo By Bill Clark/CQ Roll Call)

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