YOUNGSTOWN, Pennsylvania — The morning after the night before, and the line for the Trump House is 75 strong. Most were at the previous night’s rally to see President Trump fly in on Air Force One and are rounding off their visit to this corner of Pennsylvania with pictures in front of the red, white, and blue building, posing for selfies with the 14-foot figure of Trump, and collecting a free hat and yard sign in the crowded interior. Others will take down a form from the bins on the wall and, with help from owner Leslie Rossi, 49, register...