First lady Michelle Obama and late-night television host and comedian Conan O'Brien gesture toward his tie at the White House Correspondents' Association Dinner at the Washington Hilton Hotel on 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)
Christi Parsons, White House correspondent for the Chicago Tribune, Los Angeles Times and Tribune newspaper chain, from left, Chief of Staff Gen. Raymond T. Odierno, Michael Scherer, White House correspondent for TIME, late-night television host Conan O'Brien and first lady Michelle Obama attend the White House Correspondents' Association Dinner at the Washington Hilton Hotel, Saturday, April 27, 2013, in Washington. (AP Photo/Carolyn Kaster)
President Obama and first lady Michelle Obama bow their heads behind a photo of volunteer firefighter Capt. Cyrus Adam Reed, who was killed, at Thursday's memorial service for victims of last week's fertilizer plant explosion in West, Texas.
President Barack Obama and first lady Michelle Obama stand with former Presidents George W. Bush, George H.W. Bush, and their wives, former first ladies Barbara Bush, and Laura Bush amd bow their heads in prayer at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
From left, First Lady Michelle Obama, former first lady Laura Bush, former first lady Hillary Clinton, former first lady Barbara Bush, former first lady Rosalynn Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
From left, First Lady Michelle Obama, former first lady Laura Bush, former first lady Hillary Clinton, former first lady Barbara Bush and former first lady Rosalynn Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
President Barack Obama stands with first lady Michelle Obama, former first lady Barbara Bush, former President George W. Bush, and Laura Bush at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
Former President George H.W. Bush, wears pink socks as he is seated in a wheelchair with, from left, first lady Michelle Obama, President Barack Obama, former first lady Barbara Bush, and former President George W. Bush, at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)
