In 1960, the New York Yankees fired their legendary manager, Casey Stengel, for being too old. “I’ll never make the mistake of being 70 again,” Stengel quipped. If Democrats dump Joe Biden, the president might want to say the same thing about being 81. The biggest loser of the debate, besides the president himself, was First Lady Jill Biden. One assumes that she was the one with the most influence on her husband’s foolhardy decision to run for a second term and could have persuaded him...