In New York today the United Nations opened another session, and more than 120 national leaders heard President Obama's first address to the General Assembly. Obama told the UN that "misperceptions" have led to "an almost reflexive anti-Americanism," which he said, "too often has served as an excuse for…collective inaction." He said all nations must take "responsibility for a global response to global challenges." The President described his differences from the Bush Administration, and laid out "four pillars" of foreign policy. The leaders of Russia and China will also take center-stage, and crowds outside will protest Iran's President Mahmoud Ahmadinejad. We hear what Obama said about Iran and North Korea, Middle East peace, and the responsibilities of all nations. We also hear how they're responding.