Who Exposed Secret Agent Plame?

[Sweet Freedom]

http://www.nationalreview.com/may/may200507150827.asp

snip
So if Novak did not reveal that Valerie Plame was a secret agent, who did? The evidence strongly suggests it was none other than Joe Wilson himself. Let me walk you through the steps that lead to this conclusion.

The first reference to Plame being a secret agent appears in The Nation, in an article by David Corn published July 16, 2003, just two days after Novak’s column appeared. It carried this lead: “Did Bush officials blow the cover of a U.S. intelligence officer working covertly in a field of vital importance to national security — and break the law — in order to strike at a Bush administration critic and intimidate others?”

Since Novak did not report that Plame was “working covertly” how did Corn know that’s what she had been doing?