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Riot police takes cover behind their shields during clashes with demonstrators that erupted at a march to mark the 1968 Tlatelolco plaza 'massacre' in Mexico City, Thursday, Oct. 2, 2008. Hundreds of student demonstrators were killed by men with guns and soldiers on October 2, 1968, ten days before the 1968 Summer Olympics celebrations in Mexico City. (AP Photo/Alexandre Meneghini)
Democratic presidential candidate Illinois Senator Barack Obama (R) shakes hands with supporters on October 3, 2008 just before he departs the airport in Lansing, Michigan on his way to Philadelphia. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
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