Our interest in a single Supreme Court case has perhaps never been as high as it is in a case currently being briefed. The issues are fascinating on several levels, and the potential impact of a ruling is big. The case is McDonald v. City of Chicago, for which the court granted cert on Sept. 30. The petitioners in the case, a group challenging a gun-control ordinance in Chicago, filed their brief with the court earlier this week. Were the court to adopt their position — something well within the realm of possibility — we could be looking at a...