Pennsylvania voters went to the polls last week to help carry on a centuries-old practice that no other state does: elections to choose their election workers. “It was a great idea in the 1800s that they never got rid of,” said Thad Hall, Mercer County’s election director, who just oversaw a primary to select the Democratic and Republican candidates for more than 150 poll worker positions. Counties are still finalizing the results from the May 20 election. The counting includes the slow process of tabulating write-in votes, as many races don’t have candidates listed on the ballot. In Mercer County,...