Washington D.C. (Gallery) Obama Admin.:Inauguration:Washington D.C. [1p.4n]Obama Admin.:President:Barack Obama [1p.1n]Obama Admin.:Foreign Secretary:Hillary Clinton [1p.1n]Obama Admin.:President:Barack Obama:Inauguration:Washington D.C. [1p.4n] p1   p1   p1   Musician Mariah Carey performs during the Neighborhood Inaugural Ball in Washington January 20, 2009. Barack Obama took power as the first black U.S. president on Tuesday and quickly turned the page on the Bush years, urging Americans to rally to end the worst economic crisis in generations and repair the U.S. image abroad click to open Musician Mariah Carey performs during the Neighborhood Inaugural Ball in Washington January 20, 2009. Barack Obama took power as the first black U.S. president on Tuesday and quickly turned the page on the Bush years, urging Americans to rally to end the worst economic crisis in generations and repair the U.S. image abroad click to open Beyonce sings for U.S. President Barack Obama and first lady Michelle during their first dance of the evening at the Neighborhood Inaugural Ball in Washington January 20, 2009 click to open Beyonce sings for U.S. President Barack Obama and first lady Michelle during their first dance of the evening at the Neighborhood Inaugural Ball in Washington January 20, 2009 click to open   p1   p1   p1