President Barack Obama ackowledges late-night television host and comedian Conan O'Brien during the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Barack Obama ackowledges late-night television host and comedian Conan O'Brien during the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Barack Obama speaks at the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
Late-night television host Conan O'Brien, from left, first lady Michelle Obama, Michael Clemente, executive vice president of Fox News, and President Barack Obama attend the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Barack Obama talks with Michael Clemente, executive vice president of Fox News, as White House Correspondent Association President Ed Henry, chief White House correspondent for Fox News, sits right, during the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Barack Obama looks to the podium during the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Barack Obama listens as former President George W. Bush speaks during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)
President Barack Obama is introduced by Cecilia Boone, chair of the board of Planned Parenthood, before speaking at the 2013 Planned Parenthood National Conference in Washington, Friday, April 26, 2013. (AP Photo/Charles Dharapak)
President Barack Obama attends the memorial for firefighters killed at the fertilizer plant explosion in West, Texas, at Baylor University in Waco, Texas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
