Politics

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Vice President Joseph R. Biden Jr. speaks at the Tennessee Democratic Party's annual Jackson Day event on Friday, July 16, 2010, in Nashville, Tenn. (AP Photo/Mark Humphrey)

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FILE - In this May 18, 2010 file photo, U.S. soldiers load dead bodies on a vehicle after a suicide attack in Kabul, Afghanistan. A Taliban suicide car bomber struck a NATO convoy in the Afghan capital Tuesday, killing six troops - five Americans and one Canadian, officials said. Twelve Afghan civilians also died, many of them on a public bus in rush-hour traffic. Escalating violence in Afghanistan is now the worst since the early months of the nearly 9-year-old war, killing 1,074 civilians so far this year as international forces struggle to establish security, an Afghan rights group said Monday, July 12, 2010. (AP Photo, File)

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A lieutenant colonel of the Iranian elite Revolutionary Guard, attends Friday prayers with his colleague at Tehran University campus in Tehran, Iran, Friday, July 16, 2010. A Sunni insurgent group said it carried out a double suicide bombing against a Shiite mosque in southeast Iran to avenge the execution of its leader, as Iranian authorities Friday said the death toll included members of the elite Revolutionary Guard. (AP Photo/Vahid Salemi)

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Attorney General Eric H. Holder Jr., right, announces 36 arrests in Medicare scams during a press conference as Health and Human Services Secretary Kathleen Sebelius looks on in Miami, Friday, July 16, 2010. Federal authorities said they are conducting the largest Medicare fraud bust ever in five different states and arrested dozens of suspects accused in scams totaling $251 million. (AP Photo/Alan Diaz)

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Palestinian, Israeli and foreign protesters run from tear gas fired by Israeli soldiers during a demonstration against Israel's separation barrier in the West Bank village of Bilin, near Ramallah, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Ishtayeh)

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Palestinian protesters run from tear gas fired by Israeli soldiers, not seen, during a demonstration against Israel's separation barrier in the West Bank village of Maasarah, near Bethlehem, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Shiyoukhi)

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Palestinian, Israeli and foreign protesters run from tear gas fired by Israeli soldiers, not seen, during a demonstration against Israel's separation barrier in the West Bank village of Bilin, near Ramallah, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Ishtayeh)

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A Palestinian protester kicks a tear gas canister fired by Israeli soldiers, not seen, during a demonstration against Israel's separation barrier in the West Bank village of Bilin, near Ramallah, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Ishtayeh)

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A Palestinian protester is detained during a demonstration against Israel's separation barrier in the West Bank village of Maasarah, near Bethlehem, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Shiyoukhi)

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A Palestinian protester is detained during a demonstration against Israel's separation barrier in the West Bank village of Maasarah, near Bethlehem, Friday, July 16, 2010. Israel says the barrier is necessary for security while Palestinians call it a land grab. (AP Photo/Nasser Shiyoukhi)

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President Barack Obama makes a statement on the capping of the BP well in the Gulf, Friday, July 16, 2010, in the Rose Garden at the White House in Washington, (AP Photo/Susan Walsh)

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This picture released by Iran's official Islamic Republic News Agency shows the scene of the bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo / Islamic Republic News Agency, IRNA)

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This picture released by Iran's official Islamic Republic News Agency shows the scene of the bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)

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This picture released by Iran's official Islamic Republic News Agency shows the scene of the bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)

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This picture released by Iran's official Islamic Republic News Agency shows the victims of a bomb blast in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday -- including members of the powerful Revolutionary Guard -- in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)

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In this picture released by Iran's official Islamic Republic News Agency, bodies of victims of bomb blasts lie on the street, in the city of Zahedan, 940 miles southeast of the capital Tehran Thursday, July 15, 2010. Twin bombings killed more than 20 people outside a mosque in southeastern Iran on Thursday _ including members of the powerful Revolutionary Guard _ in attacks that came less than a month after Iran hanged the leader of a militant insurgent group in the region. (AP Photo/Islamic Republic News Agency, IRNA)