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It's not premature at all to criticize Obama for his 'establishment-soothing appointments' because this is what he did -
I agree it's absolutely appropriate to evaluate and be critical of his appointments. And one would expect that this is going to be SOP not just for Obama, but for all presidents from now on. Not because of anything the POTUS has done, but rather because of the evolution of the netroots. Things are going to be looked at much more closely, and by many many more people, than has been "usual". And this is all to the good imo.
But I don't think he's making these appointments in order to soothe anyone in particular. It's simply that he's a centrist and all his picks are from, and in, that hugely diverse and varied Center. Why, the sheer scope of the diversity, the multi-faceted nature of it, it's beyond description.