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U.S. President Barack Obama and British Prime Minister David Cameron embrace after a toast during the State Dinner at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

U.S. President Barack Obama and British Prime Minister David Cameron embrace after a toast during the State Dinner at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

U.S. President Barack Obama and British Prime Minister David Cameron embrace after a toast during the State Dinner at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque
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U.S. President Barack Obama and British Prime Minister David Cameron stand together during an official Arrival Ceremony on the South Lawn of the White House in Washington, March 14, 2012. REUTERS/Jason Reed

U.S. President Barack Obama and British Prime Minister David Cameron stand together during an official Arrival Ceremony on the South Lawn of the White House in Washington, March 14, 2012. REUTERS/Jason Reed

U.S. President Barack Obama and British Prime Minister David Cameron stand together during an official Arrival Ceremony on the South Lawn of the White House in Washington, March 14, 2012. REUTERS/Jason Reed
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British Prime Minister David Cameron raises his glass in a toast during the State Dinner in his honor at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

British Prime Minister David Cameron raises his glass in a toast during the State Dinner in his honor at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

British Prime Minister David Cameron raises his glass in a toast during the State Dinner in his honor at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque
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President Barack Obama (R) and first lady Michelle (2nd L) welcome British Prime Minister David Cameron and his wife Samantha to the White House for a State Dinner in Washington March 14, 2012. REUTERS/Kevin Lamarque

President Barack Obama (R) and first lady Michelle (2nd L) welcome British Prime Minister David Cameron and his wife Samantha to the White House for a State Dinner in Washington March 14, 2012. REUTERS/Kevin Lamarque

President Barack Obama (R) and first lady Michelle (2nd L) welcome British Prime Minister David Cameron and his wife Samantha to the White House for a State Dinner in Washington March 14, 2012. REUTERS/Kevin Lamarque
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Actor George Clooney sits beside first lady Michelle Obama during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

Actor George Clooney sits beside first lady Michelle Obama during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

Actor George Clooney sits beside first lady Michelle Obama during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque
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Business magnate Warren Buffett and his wife Astrid Menks arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Business magnate Warren Buffett and his wife Astrid Menks arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Business magnate Warren Buffett and his wife Astrid Menks arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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Entrepreneur Richard Branson (L) and Steve Hilton, former advisor to British Prime Minister David Cameron, talk at the State Dinner held to honor British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

Entrepreneur Richard Branson (L) and Steve Hilton, former advisor to British Prime Minister David Cameron, talk at the State Dinner held to honor British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin...more

Entrepreneur Richard Branson (L) and Steve Hilton, former advisor to British Prime Minister David Cameron, talk at the State Dinner held to honor British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque
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Actor George Clooney and Obama advisor Valerie Jarrett talk during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

Actor George Clooney and Obama advisor Valerie Jarrett talk during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque

Actor George Clooney and Obama advisor Valerie Jarrett talk during the State Dinner for British Prime Minister David Cameron at the White House in Washington March 14, 2012. REUTERS/Kevin Lamarque
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First Lady Michelle Obama speaks to school girls during a press preview of the table setting for the State Dinner with President Barack Obama and David Cameron in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

First Lady Michelle Obama speaks to school girls during a press preview of the table setting for the State Dinner with President Barack Obama and David Cameron in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua...more

First Lady Michelle Obama speaks to school girls during a press preview of the table setting for the State Dinner with President Barack Obama and David Cameron in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts
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A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts (UNITED STATES - Tags: POLITICS FOOD)

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts (UNITED STATES -...more

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts (UNITED STATES - Tags: POLITICS FOOD)
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A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts
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A table setting for the State Dinner with President Barack Obama and David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts
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A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts

A table setting for the State Dinner with President Barack Obama and Britain Prime Minister David Cameron, is shown during a preview in the State Dining Room at the White House in Washington March 14, 2012. REUTERS/Joshua Roberts
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Golfer Rory McIlroy and Conor Ridge (R) arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Golfer Rory McIlroy and Conor Ridge (R) arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Golfer Rory McIlroy and Conor Ridge (R) arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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Maryland Governor Martin O'Malley and his wife Katie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Maryland Governor Martin O'Malley and his wife Katie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

Maryland Governor Martin O'Malley and his wife Katie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Congressman John Dingell and his wife Deborah arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Congressman John Dingell and his wife Deborah arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Congressman John Dingell and his wife Deborah arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Ambassador Louis Susman and his wife Marjorie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Ambassador Louis Susman and his wife Marjorie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Ambassador Louis Susman and his wife Marjorie arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Associate Justice Antonin Scalia arrives with his wife Maureen arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Associate Justice Antonin Scalia arrives with his wife Maureen arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Associate Justice Antonin Scalia arrives with his wife Maureen arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Senator John Kerry (D-MA) and his wife Teresa Heinz arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Senator John Kerry (D-MA) and his wife Teresa Heinz arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Senator John Kerry (D-MA) and his wife Teresa Heinz arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Secretary of Health and Human Services Kathleen Sebelius and her son Ned Sebelius arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Secretary of Health and Human Services Kathleen Sebelius and her son Ned Sebelius arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012....more

U.S. Secretary of Health and Human Services Kathleen Sebelius and her son Ned Sebelius arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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U.S. Attorney General Eric Holder and his wife Sharon Malone arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Attorney General Eric Holder and his wife Sharon Malone arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers

U.S. Attorney General Eric Holder and his wife Sharon Malone arrive for a State Dinner held in honor of Britain's Prime Minister David Cameron and his wife Samantha at the White House in Washington March 14, 2012. REUTERS/Benjamin Myers
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President Barack Obama (R) and first lady Michelle (2nd L) walk in for an official dinner with Britain's Prime Minister David Cameron and his wife Samantha as they arrive at the White House in Washington, March 14, 2012. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS)

President Barack Obama (R) and first lady Michelle (2nd L) walk in for an official dinner with Britain's Prime Minister David Cameron and his wife Samantha as they arrive at the White House in Washington, March 14, 2012. REUTERS/Jonathan Ernst...more

President Barack Obama (R) and first lady Michelle (2nd L) walk in for an official dinner with Britain's Prime Minister David Cameron and his wife Samantha as they arrive at the White House in Washington, March 14, 2012. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS)
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First lady Michelle Obama kisses Samantha Cameron as they and their husbands, President Barack Obama and Britain's Prime Minister David Cameron arrive for an official dinner in their honor at the White House in Washington, March 14, 2012. REUTERS/Jonathan Ernst

First lady Michelle Obama kisses Samantha Cameron as they and their husbands, President Barack Obama and Britain's Prime Minister David Cameron arrive for an official dinner in their honor at the White House in Washington, March 14, 2012....more

First lady Michelle Obama kisses Samantha Cameron as they and their husbands, President Barack Obama and Britain's Prime Minister David Cameron arrive for an official dinner in their honor at the White House in Washington, March 14, 2012. REUTERS/Jonathan Ernst
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Britain's Prime Minister David Cameron (C) laughs as U.S. Vice President Joe Biden (R) jokingly mentions that his Irish grandfather was not a fan of the British during remarks by Biden and Secretary of State Hillary Clinton as they played host to a luncheon for Cameron at the State Department in Washington March 14, 2012. REUTERS/Jonathan Ernst (

Britain's Prime Minister David Cameron (C) laughs as U.S. Vice President Joe Biden (R) jokingly mentions that his Irish grandfather was not a fan of the British during remarks by Biden and Secretary of State Hillary Clinton as they played host to a...more

Britain's Prime Minister David Cameron (C) laughs as U.S. Vice President Joe Biden (R) jokingly mentions that his Irish grandfather was not a fan of the British during remarks by Biden and Secretary of State Hillary Clinton as they played host to a luncheon for Cameron at the State Department in Washington March 14, 2012. REUTERS/Jonathan Ernst (
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