IN THE WALL STREET JOURNAL:

The suspense ended Friday for I. Lewis Libby, but one of the case’s biggest questions remained unanswered: What was the exact role of Robert Novak, the journalist whose column unmasked CIA operative Valerie Plame?

While it is now clear that the testimony of reporters Tim Russert, Matt Cooper and Judith Miller was crucial to Patrick Fitzgerald’s leak investigation, it still isn’t known who was Mr. Novak’s primary source.

Indeed. Read the whole thing.