Due no doubt to a remarkable financial acumen that allowed him to stretch a career government official’s salary to astounding lengths, a luxurious retirement on the Delaware shore worthy of any top-tier Goldman Sachs executive beckoned to former vice-president Joe Biden in 2019. But, attractive as it must have seemed, he declined to heed the call. As he saw it, an appointment with destiny awaited him, and it needed to be kept. Polls showed Biden as the only Democrat with a realistic chance of beating Donald Trump, so despite having lost two prior attempts at the nomination, and cognitive decline...