Cliff May: What Did He Know and When Did He Know It?

I guess Mr. May is the class clown over at the National Review. You may recall that his first excuse for the 7/14/2003 column by Robert Novak was the premise that it was common knowledge that Valerie Plame was a CIA agent. But now Mr. May claims we could not have known that she was a CIA agent until one read the 7/16/2003 column from David Corn. Given that Mr. Corn simply told his readers what Mr. Novak had written, I assume Mr. May is simply making some sort of weird joke.