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“IT is not going too far to say that American foreign policy has become completely subservient to tactical domestic political considerations.” This stern verdict comes from Vali Nasr, who spent two years working for the Obama administration before becoming dean of the John Hopkins School of Advanced International Studies. In a book called “The Dispensable Nation,” to be published in April, Nasr delivers a devastating portrait of a first-term foreign policy that shunned the tough choices of real diplomacy, often descended into pettiness, and was controlled “by a small cabal of relatively inexperienced White House advisers.”