This isn’t a policy election. There’s no defining issue like tax cuts in 2000 or health care in 2008 or trade in 2016. Democrats are focused on convincing voters that Donald Trump poses an existential threat to the American way of life, and vice versa. But policy remains the purpose of politics, and the choice of a president is also the choice of a housing policy. Kamala Harris has a plan to address the nation’s housing crisis. Donald Trump (kind of) has one, too. And the differences say a lot about the two candidates. Housing prices across the country have...