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Cecil Roberts, president of the United Mine Workers, left, lifts up Democratic candidate Conor Lamb's hand as the crowd erupts in cheers and chants during a rally, Sunday, March 11, 2018, at the Greene County Fairgrounds in Waynesburg, Pa. Lamb is running against state Rep. Rick Saccone for Pennsylvania's 18th Congressional District in a special election on Tuesday. (Antonella Crescimbeni/Pittsburgh Post-Gazette via AP)