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Sam Nunn hopes to keep nuclear materials out of the hands of terrorists by getting cooperation from other nations.
03:13 — Sam Nunn, John King and Christine Romans tell Ali Velshi why the looming spending cuts and tax hikes are hurting us, and how we can avoid them.
04:38 — Former Senator Sam Nunn, who has spent decades trying to stop the spread of nuclear weapons, weighs in.
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Looking back at the last decade of the Oscar-nominee's style.