The First 100: Days 1-15 (15 images)

President Barack Obama enters the the Oval Office to begin his first day as President of the United States, at the White House in Washington on January 21, 2009. (UPI Photo/Pete Souza/White House)

President Barack Obama talks on the phone at his desk in the Oval Office Wednesday morning, January 21, 2009, during his first full day in office. (UPI Photo/Pete Souza/White House)

U.S. President Barack Obama (C) is applauded by Vice President Joseph Biden (L) and a group of retired military officers after he signed executive orders to close the Guantanamo Bay Detention facility, on his desk in the Oval Office at the White House in Washington January 22, 2009. (UPI Photo/Matthew Cavanugh/Pool)

U.S. President Barack Obama speaks to the media prior to a meeting with bipartisan Congressional leaders regarding the economy in the Roosevelt Room of the White House in Washington on January 23, 2009. From left are House Majority Whip James Clyburn, D-SC, House Majority Leader Steny Hoyer, D-MD, House Minority Leader John Boehner, R-OH, Speaker of the House Nancy Pelosi, D-CA, Obama, and Senate Majority Leader Harry Reid, D-NV. (UPI Photo/Mark Wilson/POOL)