President Obama's Justice Department continues to stonewall inquiries about why it dropped a voter intimidation case against the New Black Panther Party.

The episode—which Bartle Bull, a former civil rights lawyer and publisher of the left-wing Village Voice, calls "the most blatant form of voter intimidation I've ever seen"—began on Election Day 2008. Mr. Bull and others witnessed two Black Panthers in paramilitary garb at a polling place near downtown Philadelphia. (Some of this behavior is on YouTube.)

One...