jamie points out news that President Obama has put out a call for a world free of nuclear weapons at a speech in Prague today. He acknowledged that it was a long-term goal, perhaps not something that can be accomplished in his lifetime, but promised to encourage the US Senate to ratify the Comprehensive Test Ban treaty. According to the BBC, he also stated his desire to "negotiate a new treaty to end the production of fissile materials for nuclear weapons," and to hold a global summit within the next year to work out agreements for preventing the spread of nuclear weapons. Obama said, "As the only nuclear power to have used a nuclear weapon, the United States has a moral responsibility to act. We cannot succeed in this endeavor alone, but we can lead it." His speech came less than a day after North Korea's launch of a long-range rocket.