Until Judge Brett Kavanaugh was accused of horrible crimes—sexual assault, lewd conduct and even gang rape—his confirmation hearings could fairly, if not entirely accurately, be characterized as a “job interview.” The burden was on him to demonstrate his suitability to serve on the Supreme Court. He apparently met that burden in the eyes of a majority, a partisan one to be sure, and seemed on the way to getting the job.

But now everything has changed. So should the burden of persuasion. The behavior of which Judge Kavanaugh...