The WSJ editorializes on the recent indictments of four Acorn voter registration workers in Missouri for submitting fraudulent registrations.

We wish this were an aberration, but allegations of fraud have tainted Acorn voter drives across the country. Acorn workers have been convicted in Wisconsin and Colorado, and investigations are still under way in Ohio, Tennessee and Pennsylvania.

The good news for anyone who cares about voter integrity is that the Justice Department finally seems poised to connect these dots instead of dismissing such revelations as the work of a few yahoos. After the federal indictments were handed up in Kansas City this week, the U.S. Attorney's office said in a statement that "This national investigation is very much ongoing."