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Mitt Romney and Barack Obama’s many smiles

September 8, 2012 6:19 PM EDT University of Arkansas political science assistant professor Patrick Stewart analyzes the meaning behind the many smiles of Republican presidential nominee Mitt Romney and President Barack Obama. He is the author of “Debatable Humor: Laughing Matters on the 2008 Presidential Primary Campaign.” (JulieAnn McKellogg / The Washington Post)

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