Michelle Obama

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The South Portico of the White House is seen before President Barack Obama and first lady Michelle Obama walk on the South Lawn at the White House in Washington, Saturday, Aug. 10, 2013, as they travel to Orlando, Fla. before heading to their vacation in Martha's Vineyard. (AP Photo/Charles Dharapak)

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** FILE ** In this April 10, 2013, file-pool photo, first lady Michelle Obama talks to students at Harper High School in Chicago. (AP Photo/Nancy Stone, Pool)

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President Barack Obama with former President George H. W. Bush, first lady Michelle Obama and former first lady Barbara Bush, behind left, arrive to present the 5,000th Daily Point of Light Award to Floyd Hammer and Kathy Hamilton, a retired couple and farm owners from Union, Iowa, in the East Room of the White House in Washington, Monday, July 15, 2013. (AP Photo/Carolyn Kaster)

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President Obama greets guests at the second annual White House "Kids' State Dinner" in the East Room of the White House in Washington on Tuesday, July 9, 2013. First lady Michelle Obama welcomed 54 children to the Executive Mansion for creating winning recipes as part of a healthy-lunch contest. (AP Photo/Susan Walsh)

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**FILE** President Obama and first lady Michelle Obama greet Vietnamese President Truong Tan Sang and wife Mai Thi Hanh before the APEC leaders dinner in Honolulu on Nov. 12, 2011. (Associated Press)

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President Barack Obama, third from right, with first lady Michelle Obama, second from left, and members of the military, speaks during a Fourth of July celebration on the South Lawn of the White House in Washington, Thursday, July 4, 2013. (AP Photo/Manuel Balce Ceneta)

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First Lady Michelle Obama and celebrity TV food maven Rachael Ray. (credit: Washington Guardian)

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American first lady Michelle Obama gestures as she speaks during a meeting of African first ladies titled “Investing in Women: Strengthening Africa,” hosted by the George W. Bush Institute, on Tuesday, July 2, 2013, in Dar es Salaam, Tanzania. (AP Photo/Carolyn Kaster)

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Young girls and women wear khangas, a traditional wrap, with the image of U.S. President Barack Obama as they line up to enter the State House, in Dar es Salaam, Tanzania, Monday, July 1, 2013, to greet and perform for U.S. President Barack Obama and first lady Michelle Obama. (AP Photo/Carolyn Kaster)