FILE - In this Monday, July 7, 2014, file photo, Chicago Police Superintendent Garry McCarthy speaks at a news conference  as police displayed Chicago police display some of the thousands of illegal firearms they have confiscated so far this year in their battle against gun violence. The recent mass shooting at an Oregon community college has put the debate over gun violence and gun control into the center of the presidential race. At least some of the Republicans who are running have pointed to Chicago as proof that gun control laws don't work.