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UNITED STATES - MAY 13: Sens. Shelley Moore Capito, R-W.Va., and Joe Manchin, D-W.Va., conduct a news conference in the Capitol's Senate studio to introduce greenhouse gas legislation that aims to "rollback President Obama's Clean Power Plan," May 13, 2015. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - MAY 13: Sens. Shelley Moore Capito, R-W.Va., and Joe Manchin, D-W.Va., conduct a news conference in the Capitol's Senate studio to introduce greenhouse gas legislation that aims to "rollback President Obama's Clean Power Plan," May 13, 2015. (Photo By Tom Williams/CQ Roll Call)

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