“I think he was speaking for me, but I really didn’t [discuss a federal abortion ban with Vance].” Normally, that quote — of Donald Trump disowning his running mate’s vow that Trump would veto any federal abortion ban — would be big debate news. But it was overshadowed by media coverage of the debate’s more sensational moments. Regardless, J. D. Vance will face a tricky task come October 1, when he’s scheduled to face off with his Democratic counterpart, Tim Walz. The running-mate debate...