House Judiciary Committee Chairman Jerry Nadler held another spectacle of a hearing Tuesday as part of his impeachment dramaturgy. Former Trump campaign manager Corey Lewandowski testified to a thronged hearing room and was grilled on Russia interactions and Oval Office discussions. The day produced no new information, yet cable stations broadcast it live and newspapers ran breathless coverage.

A House Oversight subcommittee held its own hearing Wednesday. The room was almost empty; all but a few Democratic members didn’t...