Over the past 30 years, I've been paid to write almost two million words, every one of which, sooner or later, came back to the issue of guns and gun-ownership. Naturally, I've thought about the issue a lot, and it has always determined the way I vote. People accuse me of being a single-issue writer, a single- issue thinker, and a single- issue voter, but it isn't true. What I've chosen, in a world where there's never enough time and energy, is to focus on the one political issue which most clearly and unmistakably demonstrates what any politician—or political philosophy—is...