ROARING SPRING, PA. — When the Appvion Inc. paper mill plant shuts its doors for good in two weeks, putting 293 people out of work, it will mark the first significant manufacturing loss in this state since President Biden took office. “We were all completely blindsided,” said state Sen. Judy Ward, who claims she and other local officials had no hint that the plant, founded in 1866, was in danger of shuttering. Mitchell Becker, president of the local branch of United Steelworkers, the union that endorsed Biden for president, said he thought his job — which he’s kept for 25...