Presumptive Democratic presidential nominee Senator Barack Obama (D-IL) speaks at the American Israel Public Affairs Committee (AIPAC) policy conference in Washington June 4, 2008. Obama said on Wednesday Iran posed a serious threat in the Middle East and vowed to stop it from acquiring a nuclear weapon at the pro-Israel lobby group's conference. (Xinhua/Reuters Photo) Photo Gallery>>>

U.S. Democratic presidential candidate Senator Barack Obama (D-IL) is introduced by board member Lee Rosenberg (L) before speaking at the American Israel Public Affairs Committee (AIPAC) policy conference in Washington June 4, 2008. (Xinhua/Reuters Photo) Photo Gallery>>>

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