Jim Lehrer speaks to Under Secretary for Arms Control and International Security Ellen Tauscher about Iran, China and the Nuclear Summit. Tauscher talks about the progress President Obama has made in his efforts to persuade countries attending the summit to better secure their nuclear stockpiles. She says that not only has Obama recieved a committment from attendees to better secure their nuclear material, but the group as also committed to reconvene in 2012 in South Korea to continue to tackle the issue.
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