For progressives, whatever benefits nuclear weapons may have provided in the past are now outweighed by the risks they present. The Nuclear Posture Review released by the Obama Administration April 6 concludes that the greatest threats to America, are nuclear terrorism and new nuclear-armed states. To prevent both, we need the cooperation of many other nations. To get that cooperation, we must move together with them to reduce and eventually eliminate all nuclear weapons everywhere. “Clinging to nuclear weapons in excess of our security needs,” says Secretary of State Hillary Clinton, “gives other countries the motivation or the excuse to pursue their own nuclear options.”