Barack Obama

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President Obama (left) and British Prime Minister David Cameron play table tennis at Globe Academy in south London on May 24, 2011. (Associated Press)

Police officers check a manhole on Whitehall in London ahead of the visit of President Obama to 10 Downing St. on Tuesday, May 24, 2011. Mr. Obama is on a two-day state visit to the United Kingdom. (AP Photo/Sang Tan)

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Islamic supporters protest outside Downing Street in London against the visit of President Obama on Tuesday, May 24, 2011. Mr. Obama is on a two-day state visit to the United Kingdom. (AP Photo/Sang Tan)

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President Obama talks with Britain's Queen Elizabeth II during a tour of the Queen's Gallery at Buckingham Palace in London on Tuesday, May 24, 2011. (AP Photo/Charles Dharapak)

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President Obama (center left) and Prince Philip (center) review a Guard of Honor of the Scots Guard sduring an official arrival ceremony at Buckingham Palace in London on Tuesday, May 24, 2011. (AP Photo/Carolyn Kaster)

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Illustration: Professor Obama by Alexander Hunter for The Washington Times

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U.S. President Barack Obama and first lady Michelle Obama during their visit to Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

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U.S. President Barack Obama and first lady Michelle Obama meet local residents in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

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U.S. President Barack Obama meets local residents in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo, Pool)

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** FILE ** U.S. President Barack Obama drinks Guinness beer at Ollie Hayes pub in Moneygall, Ireland, May 23, 2011. (AP Photo/Charles Dharapak)

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An Irish youngster poses for a photograph with a U.S. flag painted on her face amongst people queuing up to join the crowd to listen to U.S. President Barack Obama make an address at College Green in Dublin, Monday, May 23, 2011. President Barack Obama paid a joyful visit Monday to the small Irish village where his great-great-great grandfather once lived and worked as a shoemaker, an improbable and memorable pilgrimage for America's first black president into his Irish past. (AP Photo/Matt Dunham)

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U.S. President Barack Obama greets local residents in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. (AP Photo/Charles Dharapak)

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U.S. President Barack Obama, left, reacts after he was presented with a hurley stick from Irish Prime Minister and Taoiseach Enda Kenny while in Farmleigh, Dublin Monday May 23, 2011. Obama said Monday that the U.S. and Ireland share a "blood link" that extends beyond strategic interests or foreign policy into the hearts of the millions of Irish Americans who still see a homeland here.(AP Photo, Pool)

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President Barack Obama, left, holds and swings a hurling stick as Ireland's Taoiseach Enda Kenny, second from left, looks on he and first lady Michelle Obama leave Farmleigh House after after a visit in Dublin, Ireland, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse.(AP Photo/Carolyn Kaster)

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President Barack Obama, left, and first lady Michelle Obama, right, are greeted by Ireland's Taoiseach Enda Kenny, second from right, and his wife Fionnuala Kenny as they arrive at Farmleigh House in Dublin, Ireland, Monday, May 23, 2011. (AP Photo/Carolyn Kaster)

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President Barack Obama, is shown how to hold a hurling stick by Ireland's Taoiseach Enda Kenny, in front of Farmleigh House in Dublin, Ireland, Monday, May 23, 2011. (AP Photo/Carolyn Kaster)

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US President Barack Obama, left, and Taoiseach Enda Kenny shake hands during talks in Farmleigh, Dublin Monday May 23, 2011. President Barack Obama said Monday that the U.S. and Ireland share a "blood link" that extends beyond strategic interests or foreign policy into the hearts of the millions of Irish Americans who still see a homeland here. (AP Photo, Pool)

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U.S. President Barack Obama and first lady Michelle Obama disembark from Air Force One as they arrive at Dublin Airport to begin a 24-hour visit to the Republic of Ireland, in Dublin, Monday, May 23, 2011. President Barack Obama opens a six-day European tour with a quick dash through Ireland, where he will celebrate his own Irish roots and look to give a boost to a nation grappling with the fallout from its financial collapse. (AP Photo/Matt Dunham)

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U.S. President Barack Obama drinks Guinness beer as he meets with local residents at Ollie Hayes pub in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23, 2011. (AP Photo/Charles Dharapak)