Michelle Obama

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First lady Michelle Obama, from left, President Barack Obama, and daughter Malia Obama react as they watch Team USA and Brazil during the first half of an Olympic exhibition basketball game, Monday, July 16, 2012, in Washington. (AP Photo/Alex Brandon)

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First lady Michelle Obama gives the keynote address at the general conference of the African Methodist Episcopal Church on Thursday, June 23, 2012, in Nashville, Tenn. (AP Photo/Donn Jones)

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First lady Michelle Obama has given Family Circle a cookie recipe, as has Ann Romney, following a tradition going back to 1992.

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First lady Michelle Obama talks to children about food during an appearance in May 2012 with host Robin Roberts (right) on "Good Morning America." Mrs. Obama's book, "American Grown: The Story of the White House Kitchen Garden and Gardens Across America," was being released. (ABC via Associated Press)

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Corn soup with summer vegetables, a recipe by White House chef Sam Kass, is part of first lady Michelle Obama's book, "American Grown: The Story of the White House Kitchen Garden and Gardens Across America." (Crown Publishing via Associated Press)

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Michelle Obama is behind the "Let's Play!" program, a fitness initiative aimed at combating childhood obesity. (Associated Press)

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President Obama, whose appearances filled stadiums with enthusiastic crowds in 2008, officially kicked off his re-election campaign Saturday in Columbus, Ohio with first lady Michelle Obama before 14,000 supporters, leaving about a quarter of the seats empty. (Associated Press)

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First lady Michelle Obama

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This handout image provided by the White House shows the signature page of President Obama and first lady Michelle Obama's tax return. The White House says the president and his family paid more than $160,000 in federal taxes last year. (Associated Press/White House)