Yes, I know that it is tempting to rebut arguments from the left, no matter how unfounded and idiotic those arguments may be, but IMHO #4 is a non-sequitur that does little, if anything, to add to the already strong and relevant arguments in the rest of the piece. I think the issue here is that if President Bush wanted Plame to be covert, he would have demonstrated some major annoyance at having her exposed. If he didn't want her to be covert, her exposure would not be a crime.