Audra McDonald performs in the East Room of the White House during the National Governors Association Dinner hosted by President Barack Obama and First Lady Michelle Obama, Feb. 24, 2013.

Audra McDonald performs in the East Room of the White House during the National Governors Association Dinner hosted by President Barack Obama and First Lady Michelle Obama, Feb. 24, 2013.

Feb. 24, 2013 "The President and First Lady joke with the Vice President and Dr. Biden in the Blue Room of the White House before the National Governors Association Dinner." (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

Feb. 24, 2013
"The President and First Lady joke with the Vice President and Dr. Biden in the Blue Room of the White House before the National Governors Association Dinner." 
(Official White House Photo by Pete Souza)

This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

President Barack Obama and First Lady Michelle Obama talk with Vice President Joe Biden and Dr. Jill Biden in the Blue Room of the White House before the National Governors Association Dinner, Feb. 24, 2013.

President Barack Obama and First Lady Michelle Obama talk with Vice President Joe Biden and Dr. Jill Biden in the Blue Room of the White House before the National Governors Association Dinner, Feb. 24, 2013.

President Barack Obama meets with Chief of Staff Denis McDonough in the Oval Office, Jan. 25, 2013.

President Barack Obama meets with Chief of Staff Denis McDonough in the Oval Office, Jan. 25, 2013.

President Barack Obama meets with Presidential Innovation Fellows in the Roosevelt Room of the White House, Jan. 25, 2013.

President Barack Obama meets with Presidential Innovation Fellows in the Roosevelt Room of the White House, Jan. 25, 2013.

David Plouffe, second from left, receives applause as President Barack Obama thanks Plouffe for his service, during an event in the East Room of the White House, Jan. 25, 2013. Communications Director Jennifer Palmieri, left, Senior Advisor Dan Pfeiffer, and Alyssa Mastromonaco, Deputy Chief of Staff for Ops, are seated next to Plouffe.

David Plouffe, second from left, receives applause as President Barack Obama thanks Plouffe for his service, during an event in the East Room of the White House, Jan. 25, 2013. Communications Director Jennifer Palmieri, left, Senior Advisor Dan Pfeiffer, and Alyssa Mastromonaco, Deputy Chief of Staff for Ops, are seated next to Plouffe.

Jan. 25, 2013 "On a cold day, the President races down the Colonnade with Denis McDonough’s children en route to the announcement that Denis would become the new Chief of Staff." (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

Jan. 25, 2013
"On a cold day, the President races down the Colonnade with Denis McDonough's children en route to the announcement that Denis would become the new Chief of Staff." 
(Official White House Photo by Pete Souza)

This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.

President Barack Obama runs along the Colonnade of the White House with Deputy National Security Advisor Denis McDonough’s children, Jan. 25, 2013. The President announced McDonough will become Chief of Staff, replacing Jack Lew, the nominee for Treasury Secretary.

President Barack Obama runs along the Colonnade of the White House with Deputy National Security Advisor Denis McDonough's children, Jan. 25, 2013. The President announced McDonough will become Chief of Staff, replacing Jack Lew, the nominee for Treasury Secretary.

Bo, the Obama family dog, plays in the snow in the Rose Garden of the White House, Jan. 24, 2013.

Bo, the Obama family dog, plays in the snow in the Rose Garden of the White House, Jan. 24, 2013.

After reading "’Twas the Night Before Christmas" President Barack Obama greets second grade students at Long Branch Elementary School in Arlington, Va., Dec. 17, 2010.

After reading "'Twas the Night Before Christmas" President Barack Obama greets second grade students at Long Branch Elementary School in Arlington, Va., Dec. 17, 2010.