The danger -- and one that extends beyond the sometimes mean streets of the nation's capital -- is that the high court will endorse not only the appeals court's decision but also its radical reinterpretation of the 2nd Amendment. That would threaten even reasonable gun-control laws. The 2nd Amendment reads in full: "A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms, shall not be infringed." The dominant -- though not unanimous -- interpretation is that the first clause limits the second, making the right to bear...