Obama sheds tears while talking about his grandmother Madelyn Dunham, who passed away just before he won the 2008 election. Emmanuel Dunand /AFP/Getty Images hide caption

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Republican presidential candidates at the "Thanksgiving Family Forum" in Des Moines on Nov. 19, 2011. Brad Horn/NPR hide caption

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Opponents of a law limiting collective-bargaining rights cheer in Cleveland as they hear election results sounding the defeat of the measure in the Ohio general election on Tuesday. Amy Sancetta/AP hide caption

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Protesters against Senate Bill 5 during a rally in February 2011 in Columbus.

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Texas Gov. Rick Perry addressed the Veterans of Foreign Wars 112th National Conference on Aug. 29. He'll participate in his first presidential debate this week. Eric Gay/AP hide caption

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Texas Gov. Rick Perry announces that he will run for the Republican presidential nomination, in Charleston, S.C., on Saturday. Richard Ellis/Getty Images hide caption

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