In the past few months, some 50 people have been slaughtered in the United States in mass attacks involving firearms. Police officers in Oakland, Calif., and Pittsburgh were mowed down by gunmen using assault weapons. In the past year, thousands have been killed in Mexico, victims of crime rings that cavalierly buy and then smuggle assault weapons from the United States. Mexican President Felipe Calderón and President Obama said during a news conference in Mexico... (GunPolicy.org)