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, April 27, 2013, in Washington.

President Barack Obama talks with Ed Henry, President of the White House Correspondents' Association (WHCA) during the organization's annual dinner on April 27, 2013 in Washington, DC. The dinner is an annual event attended by journalists, politicians and celebrities.

New York Mayor Michael Bloomberg talks with actress Barabara Streisand during the White House Correspondents' Association Dinner on April 27, 2013 in Washington, DC.

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, on April 27, 2013, in Washington.

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, April 27, 2013, in Washington.

Comedian Conan O'Brien (L) smiles as US President Barack Obama (C) and US first lady Michelle Obama arrive for the White House Correspondents? Association Dinner April 27, 2013 in Washington, DC.

Comedian Conan O'Brien (L) and US first lady Michelle Obama joke during the White House Correspondents? Association Dinner April 27, 2013 in Washington, DC.

ABC's reception at the White House Correspondents' Association Gala dinner at the Washington Hilton hotel, Washington, DC on April 27, 2013.

Actor Kevin Spacey, from the Washington based Netflix series "House of Cards, the White House Correspondents' Association Dinner at the Washington Hilton Hotel, April 27, 2013, in Washington.

Conde Nast Artistic Director Anna Wintour attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Gayle King attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actor Hugh Dancy, left, his wife, actress Claire Danes from the Washington-based Showtime series "Homeland", and journalist Bob Schieffer attend the White House Correspondents' Dinner at the Washington Hilton on Saturday April 27, 2013 in Washington.

Actor Giancarlo Esposito attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

NFL player Victor Cruz (L) and Elaina Watley attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Korie Robertson and Willie Robertson attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Leslie Moonves, president and chief executive officer of CBS Corp., left, and wife, television host Julie Chen, arrive for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Megan Wollover and actor Tracy Morgan attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Piers Morgan and Gerard Butler attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

University of Louisville Cardinals basketball player Kevin Ware arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Tracy Pollan and Michael J. Fox attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Julie Bowen attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Eric Stonestreet attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Elizabeth Banks attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actor Ed Helms attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Barry Diller, chairman of IAC/InterActiveCorp., arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Sofia Vergara attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Singer Psy attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Robin Wright arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Sharon Stone attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Olympic gold-medal gymnast Gabby Douglas arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Actress Sophia Bush attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Kerry Washington arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Martha Raddatz, ABC News Senior Foreign Affairs Correspondent, tweeted this photo of her with Sam Champion and Lara Spencer at the White House Correspondents Dinner on April 27, 2013 in Washington, D.C.

Hayden Panettiere attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Julia Louis-Dreyfus, who plays the Vice President on the HBO series "VeeP", attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Jessica Pare attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Pop singer Katy Perry attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Jeffrey Katzenberg and Steven Spielberg attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actress Kate Walsh attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Arianna Huffington, co-founder of the Huffington Post, arrives for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013.

Actress Kate Mara resembles her character, Zoe Barnes on the Netflix series "House of Cards" as she attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actor John Oliver, left, and wife Kate Oliver arrive for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013. John Oliver is known for his role as a fake news correspondent for the Comedy Central show, "The Daily Show".

Actress Connie Britton attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Amy Poehler attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013 in Washington, DC.

Actors Aasif Mandvi, left, and Ty Burrell arrive for the White House Correspondents' Association (WHCA) dinner in Washington, D.C., U.S., on April 27, 2013. The 99th annual dinner raises money for WHCA scholarships and honors the recipients of the organization's journalism awards.