Is gun ownership a constitutional right? What about a “right to privacy” that makes it unconstitutional to ban birth control? And can the federal government really use the power to regulate “commerce among the several states” to make laws banning certain plants in cases when they are grown only for private use? I know of 8 approaches to interpreting the U.S. Constitution (and its amendments). None is obviously correct; some are more popular than others, but all are, in some unsatisfying sens...