LOL
They have been openly disclosing it from day one.
It wasn't Novak who identified her as covert, it was Newsday and the WaPo quickly followed.
And to this day they refer to her as such without having established beyond a reasonable doubt that was the case.
#80... If you think that to be the case, then show me one article in which the media explains the details of when Plame was covert, and when she stopped being covert.
They don't have a clue because it isn't public information. All they know is that there is a grand jury trying to determine if a crime was committed because someone reported that she's a covert operative. And from that they deduce that she must have been covert at one time.
Personally, I would say that's a pretty good deduction. I doubt that they would have convened a grand jury if it was clear that she was not covert during the applicable time period, and it seems that would be a very easy thing to determine. Afterall, it was George Tenet who asked for the investigation. Tenet was not the most competent CIA director, but I think even he could probably handle that one.