It looks like our contributor, former Attorney General Michael Mukasey, was right last week. FBI Director James Comey’s review of newly discovered Hillary Clinton-related emails was never going to change his legal judgment because the FBI and Justice Department handling of the case was never serious in the first place.

The Justice Department never went to a grand jury in the case, which was needed to gather all appropriate evidence and vet the legal charges. Judge Mukasey’s judgment was vindicated on Sunday when Mr. Comey...