In the continuing debate over how to stop mass killings in the United States, Australia has become a familiar touchstone. President Obama has cited the country's gun laws as a model for the United States, calling Australia a nation "like ours." On the campaign trail, Hillary Clinton has said the Australian approach is "worth considering." The National Rifle Association has dismissed the policies, contending that they "robbed Australians of their right to self-defense... (GunPolicy.org)