Nearly half of all vote-by-mail ballots in Pennsylvania had already been cast before Tuesday night’s U.S. Senate debate, which was judged a disaster — even by Democrats — after Lt. Gov. John Fetterman (D), recovering from a stroke, struggled to form coherent sentences. Fetterman had sought to avoid a debate, and his campaign has restricted his public appearances.. When he finally agreed to one, Democrats sought to delay the debate until ballots were already being cast by mail, since Democrats are more likely to use that method and more of the party’s vote would already be cast. However, given that...