U.S. President Barack Obama signs a Book of Guests at the Prime Minister's Chancellery, as Polish Prime Minister Donald Tusk, right, looks on, in Warsaw, Poland, Saturday, May 28, 2011, on the second ... more 
U.S. President Barack Obama signs a Book of Guests at the Prime Minister's Chancellery, as Polish Prime Minister Donald Tusk, right, looks on, in Warsaw, Poland, Saturday, May 28, 2011, on the second day of Obama's visit to Poland. less 
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Associated Press | Photo By Alik Keplicz
Sat, May 28, 2011 8:38 AM EDT