More than 50 senators signed a petition months ago indicating their opposition to the ATT, and the treaty requires a yes vote by 67 of the 100 senators. Some treaty proponents suggest that the fact that Iran, North Korea, and Syria were the only nations to vote against the treaty might make some senators rethink their opposition.
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Obozo will sign the treaty to prove to the rest of the world he really deserves his Nobel Peace Prize. He knows full well the Senate will never ratify it. This is the same situation Wilson faced with the ratification of the League of Nations treaty. The League of Nations didn't prevent the rise of Nazi Germany. The United Nations is an impotent joke.