A famous country song aptly summed up where the Republicans are with Senate candidate Roy Moore in Alabama: You’ve got to know when to fold ’em.

There is no doubt a sense in which Mr. Moore deserves the opportunity to challenge accusations against him for acts alleged to have happened more than 30 years ago. Though too many women were too easily ignored in the past, we do not want to live in a country or political culture in which every accusation of sexual misconduct is automatically accepted as true. Accusers can be liars...