ou know Hillary Clinton’s voice, right? I mean, you know it. It’s just so loud and annoying. Or maybe it's like a nagging wife. Or inauthentic—that phony Southern accent! Those flat Midwestern vowels! Whatever it is, her voice is burned into your brain. Now think of Jeb Bush’s voice. It’s so—wait, what does it sound like again? He sounds just ... like a guy, maybe? It's probably hard for you to recall distinguishing features about most of the Republican candidates. Maybe you don’t know what Ted Cruz sounds like, except that he sounds like a jerk. Why? In part it's...