Britain's Queen Elizabeth II (second from left); President Obama; Camilla, Duchess of Cornwall, who is Prince Charles' wife; first lady Michelle Obama; and Prince Philip, the queen's husband, take part in the official welcome ceremony outside Buckingham Palace with a honor guard from the Scots Guards at the start of the president's state visit in London on Tuesday, May, 24, 2011. (AP Photo/Alastair Grant)
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