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(L-R) Britain's Queen Elizabeth II, US President Barack Obama, Britain's Prince Charles, Prince of Wales, US First Lady Michelle Obama and Prince Philip, the Duke of Edinburgh (2nd R) watch a guard of honour at Buckingham Palace, in central London, on May 24, 2011. Obama on May 24 basked in the lavish royal pageantry of a state visit to Britain, given an extra dash of glamour by a brief encounter with Prince William and his bride Catherine. But the 24-hour demands that follow a US president everywhere shadowed the London pomp, as Obama took time out to say he was "heartbroken" at the toll of vicious tornados which ripped across the US midwest, killing 116 people. TOPSHOTS AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)