During the presidential campaign, Barack Obama promised to "work with our allies and other countries to achieve a successful outcome" for a scheduled 2010 review conference on the Nuclear Non-Proliferation Treaty.

First, some background on the treaty and the conference.

In the United Nations' words, the treaty "was designed to prevent the spread of nuclear weapons and weapons technology, to further the goal of nuclear disarmament and general and complete disarmament, and to promote cooperation in the peaceful uses of nuclear energy." Specifically, each nuclear-armed party to the treaty pledges not to share nuclear weapons or nuclear technology with anyone else. At the same time, each non-nuclear-weapon state pledges not to manufacture or otherwise acquire nuclear weapons. The treaty enforces this through International Atomic Energy Agency inspections.

The treaty, which entered into force in 1970 and was extended indefinitely in 1995, requires member nations to hold a review conference every five years. The one the promise was referred to was scheduled for 2010.

The conference was held for much of the month of May 2010 at the United Nations in New York City. According to an account in the New York Times, the conference was notable for "hard-fought negotiations" over the future of the treaty, with 189 nations "reaffirming their commitment to eliminating all nuclear weapons and setting a new 2012 deadline for holding a regional conference to eliminate unconventional weapons from the Middle East."

Though challenges remain -- including the question of whether a conference on the sensitive Middle East can be pulled together in time -- the conference was considered more successful than the prior one in 2005, which ended with unbridgeable disagreements.

So the administration helped bring the conference to completion and ended up with a more harmonious outcome than the conference five years earlier. Despite continuing challenges in non-proliferation, from Iran to North Korea, we rate this a Promise Kept.