Michelle Obama

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First lady Michelle Obama, center, takes her seat with Joel McHale, star of the NBC series Community, at left, and President Barack Obama, at right, during the centennial dinner of the White House Correspondents' Association (WHCA) at the Washington Hilton Hotel, Saturday, May 3, 2014, in Washington. (AP Photo/Jacquelyn Martin)

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FILE - In this April 27, 2013 file photo, First lady Michelle Obama and late-night television host and comedian Conan O'Brien's gesture to his tie at the White House Correspondents' Association Dinner at the Washington Hilton Hotel in Washington. President Obama was set to join journalists, government officials, politicians and media personalities Saturday night at the White House Correspondents' Association dinner for an evening of humor and celebrity gazing that has become an annual tradition in the nation’s capital. (AP Photo/Carolyn Kaster)

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High school students play with a beach ball as they wait for first lady Michelle Obama to speak during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. First Lady Michelle Obama was the guest speaker. (AP Photo/Eric Gay)

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A high school student holds a sign while listening to first lady Michelle Obama speaks during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)

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First lady Michelle Obama speaks to high school students during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)

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High school students listen as first lady Michelle Obama speaks during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)

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San Antonio Mayor Julian Castro, left, and first lady Michelle Obama, right, greet high school students during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)

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First lady Michelle Obama leads high school students in a pledge for higher education during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)

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First lady Michelle Obama greets high school students during College Signing Day, an annual celebration of San Antonio high school seniors committing themselves to higher education, Friday, May 2, 2014, in San Antonio. (AP Photo/Eric Gay)