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I agree it's absolutely appropriate to evaluate and be critical of his appointments.
As the stuff I wrote about John Brennan and Holder himself attests, I obviously agree with this point. I also wrote today: "it's constructive to express views on his high-level appointments."
I just think the one thing that can be done prematurely is to draw too much meaning from them: what does it say about what Obama intends to do as President? I don't think that can be known yet (though I, like many people, obviously have my suspicions).