An examination of mass shootings in the US

Democracy Now!:

Arizona Congresswoman Gabrielle Giffords resigned her seat this week, roughly a year after she was shot through the head during a meeting with constituents outside a Tucson supermarket. The attack left six people dead and 12 others injured. As Giffords steps down, we look at the iconic semi-automatic Glock pistol used in her attack and a number of the worst mass shootings in U.S. history. Gun-control advocates have had little success calling for restrictions on Glocks or the large-capacity ammunition magazines they can accommodate. We speak with Paul Barrett, who wrote the landmark book about the infamous weapon, "Glock: The Rise of America’s Gun."