The first family

President Barack Obama, First Lady Michelle Obama, and their daughters, Malia, left, and Sasha, right, sit for a family portrait in the Oval Office, Dec. 11, 2011.

President Barack Obama walks across Lafayette Park to St. John's Episcopal Church to attend Sunday services with daughters Malia and Sasha and first lady Michelle Obama in Washington on Aug. 19, 2012.

President Barack Obama, first lady Michelle Obama and their daughters Malia and Sasha arrive at Andrews Air Force Base in Maryland on June 15, 2012, to leave for Chicago.

President Barack Obama reads from the book "Where The Wild Things Are" with first lady Michelle Obama and his daughters Sasha, second right, and Malia, right, during the White House Easter Egg Roll on the South Lawn of the White House in Washington on April 9, 2012.

President Barack Obama, first lady Michelle Obama and their daughters Sasha and Malia, right, arrive at the White House on Jan. 3, 2012, in Washington.

From left, first lady Michelle Obama, Sasha Obama, Malia Obama, and President Barack Obama, sing "Hark! The Herald Angels Sing" with performers Jennifer Hudson, Victoria Justice, and Justin Bieber, at the annual Christmas in Washington taping at the National Building Museum in Washington, Dec. 11, 2011.

President Barack Obama pardons Liberty — AP Photo/Charles Dharapak

President Barack Obama, with daughters Sasha and Malia, pardons Liberty, a 19-week old, 45-pound turkey, on the occasion of Thanksgiving, Wednesday, Nov. 23, 2011, on the North Portico of the White House in Washington. At left is National Turkey Federation Chairman Richard Huisinga.

President Barack Obama, first lady Michelle Obama and their daughters Malia and Sasha, left, walk to St John's Church across from the White House in Washington on July 17, 2011, to attend a Sunday prayer service.

President Barack Obama, along with others, sings "Happy Birthday" to first lady Michelle Obama as their daughters Malia, right, and Sasha look on as they arrive to take part in a community service project at Stuart Hobson Middle School in celebration of the Martin Luther King, Jr. Day in Washington, on Jan. 17, 2011.

President Barack Obama and his family, including first lady Michelle Obama, daughters Sasha and Malia and mother-in-law Marian Robinson, react as they push a button to light the National Christmas Tree during a ceremony on the Ellipse near the White House in Washington on Dec. 9, 2010.

President Barack Obama kisses his daughter Malia as first lady Michelle Obama and daughter Sasha look on after he delivered a speech during an event to celebrate Independence Day and to honor military heroes and their families on the South Lawn at the White House in Washington on July 4, 2009.

Annie Leibovitz/White House via Getty Images

From left, President Barack Obama, daughter Malia Obama, first lady Michelle Obama and daughter Sasha Obama sit for portrait in the Green Room of the White House on Sept. 1, 2009, in Washington.

President Barack Obama, first lady Michelle and their daughters, Malia, second left, and Sasha, introduce their new dog, a Portuguese water dog named Bo, to the White House press corps at the South Lawn of the White House on April 14, 2009, in Washington.

President Barack Obama, first lady Michelle Obama, their daughters, Malia, right, and Sasha, left, and his mother-in-law Marian Robinson, second from right, take part in the annual Easter Egg Roll, Monday, April 13, 2009, at the White House in Washington.

President Barack Obama holds his daughter Sasha as he pets the family's new dog, Bo, a 6-month-old Portuguese water dog.

The Obama family arrive at Chicago's O'Hare Airport in Chicago, Feb. 16, 2009, for their first visit back home. From left are Michelle Obama's mother, Marian Robinson, daughter Sasha, first lady Michelle Obama, and daughter Malia. The president is in the background.

President Barack Obama kisses his daughter Sasha after delivering his inaugural address during the inauguration ceremony at the U.S. Capitol in Washington, Jan. 20, 2009.

Malia Obama, 10, and Sasha Obama, 7, right, arrive at the U.S. Capitol to see their father, President-elect Barack Obama, swear-in as the 44th President of the United States and the first African-American to lead the nation in Washington, Jan. 20, 2009.

President-elect Barack Obama, leans in to talk to his daughters Malia Obama, 10, as his wife Michelle Obama looks on during "We Are One: Opening Inaugural Celebration at the Lincoln Memorial" in Washington, Jan. 18, 2009.

Malia Obama, and her sister Sasha Obama, lead their father, President-elect Barack Obama, right, and others to their Amtrak train at Philadelphia's 30th Street Station, Jan. 17, 2009, as they embarked on his inaugural whistle stop train trip to Washington.

President-elect Barack Obama kisses his daughter Sasha Obama, 7, before he speaking at 30th Street Station in Philadelphia, Jan. 17, 2009, before his inaugural whistle stop train trip to Washington.

President-elect Barack Obama looks at his daughter Malia during an event at the 30th Street Station in Philadelphia before embarking on his inaugural whistle stop train tour to Washington, Jan. 17, 2009.

President-elect Barack Obama and his wife Michelle Obama get their daughters Sasha, 7, and Malia, 10, ready for their first day of school in Washington, Jan. 5, 2009. The family stayed at the Hay Adams Hotel in Washington.

President-elect Barack Obama getting his daughter Sasha, 7, ready for their first day of school in Washington, Jan. 5, 2009.

U.S. President-elect Barack Obama, left, stands on stage along with his wife, Michelle, and daughters Malia, second right, and Sasha during an election night gathering in Grant Park on Nov. 4, 2008, in Chicago.

Michelle Obama, wife of Democratic presidential nominee, Sen. Barack Obama, D-Ill., with daughters, Malia, left, and Sasha, applaud her husband and their father's speech at the Democratic National Convention in Denver, Aug. 28, 2008.