Joseph Cirincione is president of Ploughshares Fund, a global security foundation, and author of Bomb Scare: The History and Future of Nuclear Weapons.

Obama took a big step toward his goal of locking down all vulnerable nuclear materials yesterday. Joe Cirincione says we're witnessing the end of the Dr. Strangelove world of mutual annihilation.

Our most popular president in decades is using his rock-star status to push his anti-nuclear weapons agenda—and got the unanimous backing of the Security Council on Thursday. Joseph Cirincione on Obama’s popularity with purpose.