Can Obama Persuade World on Nuclear Arms?

Clark Murdock, a nuclear expert at the Center for Strategic and International Studies think tank, said Obama had surpassed his predecessors by putting the goal of a world free of nuclear weapons at the center of his foreign policy.

"This is a full agenda that he has said he would pursue. And so in my mind it is the sincerity of the effort that distinguishes it from past efforts," Murdock said.

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