The shifting geography of the electoral battlefield is providing gun-control advocates their best opportunity in years to tilt the balance on the issue in Congress.
Since the early 1990s, the National Rifle Association has sustained an impregnable congressional blockade against new gun-control measures. But the weakest link in that chain has always been the Republican-held suburban seats in the House of Representatives, where many voters support reasonable limits on gun access. CONT.
Ronald Brownstein, The Atlantic