A motorcade of police vehicles drives down the Mall as final preparations are made for the upcoming Sate Visit to Britain of the President of the United States Barak Obama, in London, Monday, May, 23,... more 
A motorcade of police vehicles drives down the Mall as final preparations are made for the upcoming Sate Visit to Britain of the President of the United States Barak Obama, in London, Monday, May, 23, 2011. President Obama arrives in Britain for an official sate visit Tuesday. less 
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Associated Press | Photo By Alastair Grant
Mon, May 23, 2011 8:15 AM EDT