The White House on Flickr

President Barack Obama jokes with senior advisors Mona Sutphen and David Axelrod during a birthday party for senior advisor Pete Rouse at the White House on April 15.  (Pete Souza / The White House via EPA)

First Lady Michelle Obama helps greet guests to the Oval Office on April 21. Among those pictured are Chief of Staff Rahm Emanuel, former President Bill Clinton, Vice President Joe Biden and former First Lady Rosalynn Carter.  (Pete Souza / The White House via EPA)

President Obama meets with members of his Cabinet on April 20 at the White House.  (Pete Souza / The White House via EPA)

President Obama and Secretary of State Hillary Rodham Clinton talk on the South Lawn of the White House on April 9.  (Pete Souza / The White House via EPA)

President Obama and Vice President Joe Biden practice their putting on the White House putting green on April 24.  (Pete Souza / The White House via EPA)

President Obama plays with family dog Bo on the South Lawn of the White House on April 20.  (Pete Souza / The White House via EPA)

White House Chief of Staff Rahm Emanuel scans a newspaper as President Obama makes phone calls from the Oval Office on April 24.  (Pete Souza / The White House via EPA)

President Obama tosses a football in the Oval Office on April 23.  (Pete Souza / The White House via EPA)

President Obama and Sen. Ted Kennedy walk the grounds of the White House on April 21 before the signing of the Kennedy Service Act .  (Pete Souza / The White House via EPA)

President Obama’s signature on a bill Feb. 17, with the pen used for the signing.  (Pete Souza / The White House via EPA)

President Obama takes a moment in the Green Room before the virtual town hall meeting on the economy March 26, in one of the 300 pictures released by the White House on Flickr to mark his first 100 days in office.  (Pete Souza / The White House via EPA)