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A riot policeman sits on top of Mickey's Diner in downtown St. Paul, Minn., on Tuesday, September 2, 2008. Police fired chemical agent and concussion grenades to disperse a crowd of demonstrators outside the diner. (CHRIS SCHNEIDER/ROCKY MOUNTAIN NEWS) *

A riot policeman sits on top of Mickey's Diner in downtown St. Paul, Minn., on Tuesday, September 2, 2008. Police fired chemical agent and concussion grenades to disperse a crowd of demonstrators outside the diner. (CHRIS SCHNEIDER/ROCKY MOUNTAIN NEWS)  *