President Barack Obama and China's President Hu Jintao greet guests during a state arrival ceremony at the White House in Washington,  Wednesday, Jan. 19, 2011.  (AP Photo/Susan Walsh)

Photo by: Susan Walsh

President Barack Obama and China's President Hu Jintao greet guests during a state arrival ceremony at the White House in Washington, Wednesday, Jan. 19, 2011. (AP Photo/Susan Walsh)