It’s hard to acknowledge that those who worried about Biden’s age may have been right all along.Two moments in President Biden’s ABC News interview with George Stephanopoulos on Friday are likely to be remembered as the dealbreakers that provoked an open rebellion against his candidacy. As important, they were also moments when many among the president’s strongest supporters began to lose heart. Stephanopoulos asked the exactly appropriate question near the end of their conversation: “If you stay in and Trump is elected and everything you’re warning about comes to pass, how will you feel in January?” There were many right...