Why Is Robert Novak Still at Large?

Time magazine has decided to hand over notes on the outing of Valerie Plame as a CIA agent rather than have its reporter Matthew Cooper go to jail. One of the mysteries of this affair is why Cooper and Judith Miller of The New York Times are facing jail while Robert Novak, who published her name, remains at large:

"If anyone thinks they're going to jail because of me, it's madness," said Mr. Novak, a columnist for The Chicago Sun-Times and a CNN contributor. "Some people seem to think that."

Novak wrote the story outing Plame after her husband Joseph Wilson published an oped in the Times disputing the Bush administration's assertion that Iraq had sought uranium ore from Niger.