Less than six weeks before the election, one of the most profound disappointments among some of Joe Biden’s supporters is that he doesn’t even seem to be trying. If some Democrats are correct, crushing “The Donald” should have been easy. After all (according to them), Trump is an impeached, sex-offending, tax-evading, white supremacist, coronavirus-mismanaging, sexist, racist, Islamophobic, homophobic, mysogynistic, sexist liar who is wildly unpopular. And Biden has long showed a hefty advantage in the polls. If all of that’s true, then Biden need do little more than show up, and winning should be a piece of cake — a...