People gather to watch US President Barack Obama's sworn in as the 44th US president by Supreme Court Chief Justice John Roberts in front of the US Capitol in Washington, DC on January 20, 2009.

This image provided by GeoEye Satellite Image shows Washington D.C.

President-elect Barack Obama takes the oath of office from Chief Justice John Roberts to become the 44th President of the United States on Capitol Hill in Washington, Tuesday, Jan. 20, 2009.

Barack H. Obama is sworn in as the 44th president of the United States as his wife Michelle Obama holds the Bible and their daughters Malia Obama and Sasha Obama look on, on the West Front of the Capitol January 20, 2009 in Washington, DC.

President Barack Obama delivers his inaugural address after being sworn in by Chief Justice John Roberts as the 44th president of the United States as the 44th President of the United States of America at the Capitol January 20, 2009 in Washington, DC.

People cheer at the Washington Monument during the inauguration ceremony of U.S. President Barack Obama in Washington January 20, 2009.

Spectators in Times Square watch President Barack Obama take the oath of office during his inauguration Tuesday, Jan. 20, 2009 in New York.

People watch a big television screen broadcasting Barack Obama being sworn in as the 44th President of the United States of America on the West Front of the Capitol in Washington, Tuesday, Jan. 20, 2009 during a ceremony at the Paris town hall in Paris, France.

U.S. President Barack Obama and first lady Michelle Obama walk in the inaugural parade following his inauguration as the 44th President of the United States of America on January 20, 2009 in Washington, D.C.

Sasha Obama waves through the limousine window as she and her sister Malia leave Capitol Hill in Washington, Tuesday, Jan. 20, 2009.