LONDON - APRIL 1: In this handout provide by the White House, U.S. President Barack Obama and First Lady Michelle Obama are welcomed by Her Majesty Queen Elizabeth II to Buckingham Palace on April 1, 2009 in London, England. Obama is serving as the 44th President of the U.S. and the first African-American to be elected to the office of President in the history of the United States. (Photo by Pete Souza/White House via Getty Images)
