U.S. President Barack Obama delivers a speech at the Lincoln Tribute ceremony at the Capitol Hill in Washintong, D.C., capital of the United States, Feb. 12, 2009. [Zhang Yan/Xinhua]

U.S. President Barack Obama (C) delivers opening remarks during the White House Forum on Health Reform in Washington D.C., capital of the United States, March 5, 2009. [Zhang Yan/Xinhua]