Sean Penn and Mayor Rahm Emanuel

Sean PennRahm EmanuelChicago MayorMikhail S Gorbachev
Actor Sean Penn (left) and Mayor Rahm Emanuel chat while former Russian President Mikhail Gorbachev speaks with students at Frederick Von Steuben Metropolitan Science Center as part of the World Summit of Nobel Peace Laureates April 23, 2012. Photo by Scott Olson/Getty Images
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