Jason Reed / Reuters US Sen. Barack Obama's wife, Michelle, and daughter Sasha watch as the Democratic Party senator from Illinois speaks to the crowd during a rally at Iowa State University in Ames on Feb. 11, 2007. Obama formally announced his 2008 campaign for president during a rally the day before. Scott Olson / Getty Images Michelle Obama fist-bumps her husband before an election night rally at the Xcel Energy Center on June 3, 2008, in St. Paul, Minnesota. Kevin Lamarque / Reuters Michelle Obama walks down Pennsylvania Avenue with the newly sworn-in 44th president of the United States, Barack Obama, during the inaugural parade in Washington on Jan. 20, 2009. The first lady is wearing a custom-made ensemble by Cuban-born American designer Isabel Toledo. Samantha Appleton / The White House Obama looks over her speech before speaking at the Metropolitan Museum of Art in New York on May 18, 2009. Tim Sloan / AFP / Getty Images Obama hosts a fall harvest of the White House vegetable garden with help of students from Washington's Bancroft and Kimball Elementary schools on Oct. 29, 2009, in Washington, DC. Chuck Kennedy / The White House Obama, accompanied by children from low-income communities in the region, tours the National Craft Museum in New Delhi, India, on Nov. 8, 2010. Chuck Kennedy / The White House Obama greets Marines following her remarks to 3,000 Marines, soldiers, sailors, and military family members at Memorial Field House in Camp Lejeune, North Carolina, on April 13, 2011. The event was part of the launch of Joining Forces, a national initiative to support and honor America's service members and their families. Lawrence Jackson / The White House Obama greets students following a flash mob dance at Alice Deal Middle School in Washington, DC, on May 3, 2011. Lawrence Jackson / The White House Obama waits to be introduced during an event at the Claremont Hotel Club and Spa in Berkeley on June 14, 2011. Samantha Appleton / The White House Obama meets with former President Nelson Mandela of South Africa at Mandela's home in Houghton, South Africa, on June 21, 2011. Samantha Appleton / The White House Obama huddles with children during a Joining Forces event with military families at Nationals Park in Washington, on July 5, 2011. Chuck Kennedy / The White House Obama participates in a potato sack race with Jimmy Fallon in the East Room of the White House during a Late Night taping for the second anniversary of the Let’s Move! initiative, on Jan. 25, 2012. Chuck Kennedy / The White House Obama and Ellen DeGeneres dance during a taping of The Ellen DeGeneres Show, marking the second anniversary of the Let’s Move! initiative, on Feb. 1, 2012. The White House / Getty Images Obama announces the Best Picture Oscar to Argo for the 85th Annual Academy Awards, live from the Diplomatic Room of the White House on Feb. 24. Lawrence Jackson / The White House Obama touches the Hokie Stone before walking onto the field at Lane Stadium to give the Virginia Tech commencement address in Blacksburg, Virginia, on May 11, 2012. Scout Tufankjian / Via Twitter: @BarackObama This picture of the Obamas embracing went viral after it was tweeted from the president's account with the caption "Four more years." Alex Wong / Getty Images President Obama is sworn in during the public ceremony on Jan. 21, 2013, following his re-election as president of the United States. Pete Souza / The White House The Obamas host a Passover Seder dinner for family, staff, and friends, in the Old Family Dining Room of the White House on March 25, 2013. Lawrence Jackson / The White House Obama pauses with former first ladies Laura Bush, Hillary Rodham Clinton, Barbara Bush, and Rosalynn Carter, during the dedication of the George W. Bush Presidential Library and Museum on the campus of Southern Methodist University in Dallas on April 25, 2013. Yuri Gripas / Reuters Obama hugs PBS Sesame Street characters Elmo and Rosita after delivering remarks on marketing healthier foods to children at the White House on Oct. 30, 2013. Amanda Lucidon / The White House Obama hugs her daughters, Sasha and Malia, as they visit the Great Wall of China in Mutianyu on March 23, 2014. Joshua Roberts / Reuters Obama has stickers put on her face by 20-month-old Lily Oppelt during a visit with children at the Fisher House at Walter Reed National Military Medical Center in Bethesda, Maryland, on April 14, 2014. Amanda Lucidon / The White House Obama participates in a Let's Move! taping with Richard Sherman of the Seattle Seahawks in the White House Kitchen on May 21, 2014. Pete Souza / The White House Obama wears a shawl presented to her by Tribal Chairman Dave Archambault II and Nicole Archambault at the Cannon Ball Powwow Grounds, during a visit to the Standing Rock Sioux Tribe Reservation in North Dakota on June 13, 2014. Lawrence Jackson / The White House Obama joins the cast of Disney's The Lion King onstage after their performance at the Kids' "State Dinner" in the East Room of the White House on July 18, 2014. Lawrence Jackson / The White House Obama reads over her speech backstage with Kristen Jarvis, director of external relations for the first lady, during a rally at the Strand Theatre in Dorchester, Massachusetts, Oct. 3, 2014. Lawrence Jackson / The White House Obama reaches out to a child from Children's Miracle Network Hospitals during their visit to the Eisenhower Executive Office Building of the White House on Nov. 10, 2014. Pete Souza / The White House Michelle Obama greets Sting while the president greets Tom Hanks, Lily Tomlin, and Patricia McBride, in the Blue Room during the Kennedy Center Honors reception at the White House on Dec. 7, 2014. Al Green, also an honoree, stands to Sting's left. Lawrence Jackson / The White House Obama hosts local students for a special reading of Dr. Seuss's Oh, the Things You Can Do That Are Good for You: All About Staying Healthy, during a Let's Move! event in the East Room of the White House on Jan. 21, 2015. Amanda Lucidon / The White House Obama and Meryl Streep participate in a photo shoot for More magazine in the Blue Room of the White House on Feb. 24, 2015. Jacquelyn Martin / AP The Obamas announce their Let Girls Learn initiative in the East Room of the White House on March 3, 2015. Lawrence Jackson / The White House President Barack Obama and First Lady Michelle Obama join hands with Rep. John Lewis as they lead the walk across the Edmund Pettus Bridge to commemorate the 50th Anniversary of Bloody Sunday and the Selma to Montgomery civil rights marches, in Selma, Alabama, on March 7, 2015. Malia and Sasha Obama join hands with their grandmother, Marian Robinson. Pete Souza / The White House Barack and Michelle Obama pose for photos at the Instagram #GimmeFive photo booth in the East Room of the White House during the annual Easter Egg Roll on April 6, 2015. Lawrence Jackson / The White House Obama reaches out to hug a child attending the annual "Take Our Daughters and Sons to Work Day" event in the East Room of the White House on April 22, 2015. Amanda Lucidon / The White House Obama meets with Prince Harry for tea to discuss the Let Girls Learn initiative and support for veterans, at Kensington Palace in London on June 16, 2015. Carolyn Kaster / AP Obama dances to Gloria Estefan's "Conga" in the Diplomatic Room of the White House in Washington on Nov. 16, 2015, during a Broadway at the White House event for high school students involved in performing arts programs. She is joined by Colombian dancer and choreographer Sergio Trujillo (right) and Josh Segarra (left). Pete Souza / The White House Obama talks to children across the country as part of the annual NORAD Tracks Santa program. The first lady answered the phone calls from Kailua, Hawaii, on Dec. 24, 2016. Manuel Balce Ceneta / AP Obama speaks at the 2017 School Counselor of the Year ceremony in the East Room of the White House.