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If one of the sources for ABC's story was Ivins or an associate of Ivins, planting this story would have been misdirection designed to cover up a crime.
You don't even have to go as far as Glenn does, and argue that the bentonite story was part of the propaganda campaign against Iraq. What if it was just a plain, old run of the mill cover story devised by Ivins or friends of his to throw suspicion off of Fort Detrick researchers? For no political reason at all? If there's even a possibility that was the case, by protecting their source here ABC is allowing themselves to be duped by a criminal or criminals.
Obviously if the political element here is anything like Glenn's speculations, this is a huge story. But I think it's a major story even if there was no political element at all.