Guns: when and how to regulate them. It's one of the biggest issues across the country. But the U.S. Supreme Court has rarely weighed in on the issue. In modern times, it has ruled decisively just twice. Now it's on the brink of doing so again.
With the retirement of Justice Anthony Kennedy, there now are five conservative justices who may be willing to shut down many attempts at regulation, just as the NRA's lock on state legislatures may be waning.