AP Photo/Dominic Lipinski
President Barack Obama and first lady Michelle Obama meet with Britain's Prince William and Catherine, the Duchess of Cambridge, at Buckingham Palace in London, May 24, 2011. The president and the first lady traded in Irish charm for the pomp and pageantry of Buckingham Palace as they opened a two-day state visit to Britain at the invitation of Queen Elizabeth II.
AP Photo/Dominic Lipinski
President Barack Obama, left, and first lady Michelle Obama, right, meet with Britain's Prince William and Catherine, the Duchess of Cambridge, at Buckingham Palace in London, May 24, 2011. The meeting is William and Catherine's first official royal duty since their wedding on April 29.
AP Photo/Dominic Lipinski
President Barack Obama, left, and first lady Michelle Obama, right, meet with Britain's Prince William and Catherine, the Duchess of Cambridge, second right, at Buckingham Palace in London, May 24, 2011.
AP Photo/Dominic Lipinski
President Barack Obama, left, and first lady Michelle Obama, second left, are greeted by Britain's Queen Elizabeth and Prince Philip, the Duke of Edinburgh, as they arrive at Buckingham Palace, in London, May 24, 2011, for a two-day state visit to Britain.
AP Photo/Dominic Lipinski
President Barack Obama, second left, and first lady Michelle Obama, left, pose for photographs with Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, as they arrive at Buckingham Palace, in London, May 24, 2011, for a two-day state visit to Britain.
AP Photo/Dominic Lipinski
President Barack Obama speaks to Britain's Prince Charles, as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, London, on the first day of his two-day state visit to Britain, May 24, 2011.
AP Photo/Dominic Lipinski
President Barack Obama, second left, and first lady Michelle Obama, right, walk with Britain's Prince Charles, left, and Camilla, the Duchess of Cornwall, at Winfield House, the official residence of the US Ambassador, in Regent's Park, London, May 24, 2011.
AP Photo/Dominic Lipinski
First lady Michelle Obama, right, speaks to Camilla, the Duchess of Cornwall, as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, London, May 24, 2011.
AP Photo/Dominic Lipinski
President Barack Obama speaks to Britain's Prince Charles, as they leave Winfield House, the official residence of the US Ambassador, in Regent's Park, London, on the first day of his two-day state visit to Britain, May 24, 2011.
ADRIAN DENNIS/AFP/Getty Images
President Barack Obama inspects the Guard of Honour at Buckingham Palace with Britain's Prince Philip, the Duke of Edinburgh, on May 24, 2011, in London.
AP Photo/Toby Melville
President Barack Obama inspects the Guard of Honour at Buckingham Palace with Britain's Prince Philip, the Duke of Edinburgh, on May 24, 2011, in London.
AP Photo/Dominic Lipinski
Britain's Queen Elizabeth II holds on to her hat during a gust of wind as she stands with President Barack Obama, Prince Philip, the Duke of Edinburgh, and first lady Michelle Obama during the president's official welcome ceremony at Buckingham Palace in London, May 24, 2011.
AP Photo/Tobt Melville
President Barack Obama talks to Britain's Queen Elizabeth during his official welcome ceremony at Buckingham Palace in London, May 24, 2011.
AP Photo/Alastair Grant
Britain's Queen Elizabeth II, left, President Barack Obama, Prince Charles, and Camilla, the Duchess of Cornwall, center, first lady Michelle Obama, and Prince Philip, the Duke of Edinburgh, left, take part in the official welcome ceremony at Buckingham Palace in London, May 24, 2011, on the first day of the president's two-day state visit to Britain.
AP Photo/Dominic Lipinski
President Barack Obama walks out to make a statement to reporters about tornado damage in Joplin, Mo. at Winfield House, the official residence of the US Ambassador in Regent's Park, London, May 24, 2011.
AP Photo/Dominic Lipinski
President Barack Obama makes a statement to reporters about the tornado damage in Joplin, Mo. at Winfield House, the official residence of the US Ambassador in Regent's Park, London, May 24, 2011.
AP Photo/Charles Dharapak
President Barack Obama, first lady Michelle Obama, Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, tour the Portrait Gallery at Buckingham Palace in London, Tuesday, May 24, 2011.
AP Photo/Lefteris Pitarakis
Britain's Queen Elizabeth II, right, shows President Barack Obama exhibits, as Prince Philip, the Duke of Edinburgh, and first lady Michelle Obama look on during a visit to the exhibition of American items from The Royal Collection in the Portrait Gallery of Buckingham Palace, on May 24, 2011, in London. Mr. Obama is on a two-day state visit to Britain just before attending a G-8 summit in France.
AP Photo/Carolyn Kaste
President Barack Obama, first lady Michelle Obama and the Dean of Westminster Rev. John Hall take part in a wreath laying ceremony at Westminster Abbey in London, May 24, 2011.
AP Photo/PA, John Stillwell
President Barack Obama, watched by his wife, first lady Michelle Obama, lays a wreath at the Grave of the Unknown Warrior, during a tour of Westminster Abbey, in London, May 24, 2011.
AP Photo/Sang Tan
President Barack Obama, second right, and first lady Michelle Obama, left, are greeted by British Prime Minister David Cameron and his wife, Samantha Cameron, as they arrive for a meeting at 10 Downing Street in London, May 24, 2011.
AP Photo/Paul Hackett
President Barack Obama and Britain's Prime Minister David Cameron high-five as they play table tennis at Globe Academy, in London, Tuesday May 24, 2011.
AP Photo/Paul Hackett,
President Barack Obama and Britain's Prime Minister David Cameron laugh as they play table tennis at Globe Academy, in London, May 24, 2011.
AP Photo/Carolyn Aster
President Barack Obama, escorted by John Bercow, left, Speaker of the House of Commons, and Helen Hayman, Lord Speaker of the House of Lords, walks into Westminster Hall to address members of both Houses of Parliament, in London, May 25, 2011.
AP Photo/Kirsty Wigglesworth
First lady Michelle Obama speaks to students from London's Elizabeth Garrett Anderson school at the Christ Church dining hall in the University of Oxford, May 25, 2011, in Oxford, England.
AP Photo/Kirsty Wigglesworth
First lady Michelle Obama reacts as she speaks to students from London's Elizabeth Garrett Anderson school at the Christ Church dining hall in the University of Oxford, May 25, 2011, in Oxford, England.
AP Photo/Alastair Grant
Britain's Prime Minister David Cameron, left, and President Barack Obama leave 10 Downing Street, in central London, May, 25, 2011.
AP Photo/Carolyn Kaster
President Barack Obama and Britain's Prime Minister David Cameron arrive for a joint news conference at Lancaster House, in London, May 25, 2011. The two leaders confronted complex security debates over Afghanistan, Libya and economic growth Wednesday on a day of diplomacy amid testing times for the two allies.
AP Photo/Charles Dharapak
President Barack Obama and British Prime Minister David Cameron participate in a joint news conference at Lancaster House, in London, May 25, 2011.
AP Photo/Peter Macdiarmid
British Prime Minister David Cameron, right, and President Barack Obama hold a joint press conference at Lancaster House, in London, May 25, 2011.
AP Photo/Carolyn Kaster
President Barack Obama gestures during his joint news conference with Britain's Prime Minister David Cameron, May 25, 2011, at Lancaster House, in London.
AP Photo/Charles Dharapak
President Barack Obama and British Prime Minister David Cameron shake hands after their joint news conference at Lancaster House, in London, May 25, 2011.
AP Photo/Matt Dunham-Pool
First lady Michelle Obama and Samantha Cameron, the wife of Britain's Prime Minister David Cameron, hold up serving tongs towards the media as they serve food during a barbecue in the garden of 10 Downing Street, in London, May 25, 2011. The barbecue Wednesday, where Cameron, President Barack Obama and their wives served food, was attended by members of the military from the UK and the U.S.
AP Photo/Charles Dharapak
President Barack Obama and British Prime Minister David Cameron serve sausage and burgers during a barbecue attended by British and American service members and veterans at 10 Downing Street, in London, May 25, 2011.
AP Photo/Charles Dharapak
First lady Michelle Obama gives a thumbs up before being welcomed by Britain's Queen Elizabeth II and Prince Philip for a reciprocal dinner at Winfield House in London, May 25, 2011.
JEWEL SAMAD/AFP/Getty Images
President Barack Obama and first lady Michelle Obama wait to greet Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, for a reciprocal dinner at the Winfield House, in London, on May 25, 2011.
Charles Dharapak
President Barack Obama and first lady Michelle Obama welcome Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, for a reciprocal dinner at Winfield House in London, May 25, 2011.
AP Photo/Charles Dharapak
President Barack Obama holds open the guest book for Britain's Queen Elizabeth II to sign as first lady Michelle Obama and Prince Philip, the Duke of Edinburgh, stand at right after a reciprocal dinner at Winfield House in London, May 25, 2011.
AP Photo/Charles Dharapak
President Barack Obama and first lady Michelle Obama escort Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, after a reciprocal dinner at Winfield House in London, May 25, 2011.
AP Photo/Toby Melville
President Barack Obama and first lady Michelle Obama arrive at Stansted Airport, near London, at the end of the state visit to Britain Thursday May 26, 2011.
AP Photo/Charles Dharapak
President Barack Obama walks with first lady Michelle Obama before he boards Air Force One at Stansted Airport, near London, at the end of the state visit to Britain, May 26, 2011.
AP Photo/Charles Dharapak
President Barack Obama and first lady Michelle Obama embrace as Obama boards Air Force One at Stansted Airport, near London, May 26, 2011 for France, his third stop on a four-country, six-day European tour.
