British Prime Minister David Cameron and his wife Samantha walk down the stairs from the plane upon arrival their at Andrews Air Force Base, Md., Tuesday, March 13, 2012. (AP Photo/Jose Luis Magana)

Associated Press
British Prime Minister David Cameron and his wife Samantha walk down the stairs from the plane upon arrival their at Andrews Air Force Base, Md., Tuesday, March 13,  2012. (AP Photo/Jose Luis Magana)
British Prime Minister David Cameron and his wife Samantha walk down the stairs from the plane upon arrival their at Andrews Air Force Base, Md., Tuesday, March 13, 2012. (AP Photo/Jose Luis Magana)
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