Long before the National Rifle Association tightened its grip on Congress, won over the Supreme Court and prescribed more guns as a solution to gun violence — before all that, Rep. John Dingell had a plan. First jotted on a yellow legal pad in 1975, it would transform the NRA from a fusty club of sportsmen into a lobbying juggernaut that would enforce elected officials’ allegiance, derail legislation behind the scenes, redefine the legal landscape and deploy “all available resources at every lev