Michelle Obama

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President Barack Obama and First Lady Michelle Obama dance together during the Governors Ball in the East Room of the White House, Feb. 21, 2010. (Official White House Photo by Pete Souza)

First lady Michelle Obama speaks during a luncheon at The Studio Museum of Harlem on Tuesday, Sept. 24, 2013, in New York. Mrs. Obama hosted the event for spouses of chiefs of state and heads of government participating in the U.N. General Assembly. (AP Photo/Tina Fineberg)

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President Barack Obama and First Lady Michelle Obama pretend to march to music in the Blue Room of the White House, July 4, 2010, before delivering remarks to military families during a Fourth of July celebration. (Official White House Photo by Pete Souza)

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First lady Michelle Obama is joined by actress Eva Longoria at Watertown High School in Watertown, Wis. on Thursday at an event to encourage people to drink more water. Her claim that it increases energy raised eyebrows. (ASSOCIATED PRESS)

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President Obama (from left), first lady Michelle Obama, Vice President Joseph R. Biden and Jill Biden join members of the White House staff during a moment of silence on Wednesday, Sept. 11, 2013, on the South Lawn of the White House in Washington to mark the 12th anniversary of the 9/11 attacks. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama and First Lady Michelle Obama toast during an official dinner hosted by Salvadoran President Mauricio Funes at the National Palace in San Salvador, El Salvador, March 22, 2011. (Official White House Photo by Pete Souza)

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** FILE ** First lady Michelle Obama joins exercises with pupils at Orr Elementary in Washington, Friday, Sept. 6, 2013, during a visit for a back to school event highlighting healthy changes happening in schools and across the country. (AP Photo/Manuel Balce Ceneta)