When 20 children died in a hail of gunfire in Sandy Hook, Connecticut there was an outpouring of global grief, a sense of national shame and very quickly a growing mood that this was an atrocity that would dramatically change minds and perhaps America’s gun-toting ways. Just a few months on those hopes and the political will to reform gun-laws are receding fast. One big reason - three big letters: The NRA. When deadly mass shootings happen, Americans don’t put down their guns, they race to the store to buy more, such is the success of the National Rifle Association’s spin, rhetoric and influence. How do they do it?