CNN is now confirming that the whole thing (reported incident of the Coast Guard firing on a suspicious vessel in the Potomac) was in fact a training exercise. Not clear what the misunderstanding it was or whether this was a question of one arm of the government not knowing what another arm was doing. Happily, no one, apparently, was ever in any peril. Though presumably there are a few folks whose jobs may now be in real peril.
Josh Marshall is editor and publisher of TalkingPointsMemo.com.