The unelected professionals who run campaigns compete in a fiercely Darwinian system. Most can expect a career arc and professional longevity similar to the latest Hollywood starlet’s, and even the best are routinely replaced. Ideology and technology change with election cycles, and failure can strike suddenly. It’s a cutthroat calling—and when you’re finished, and everyone else has moved on, you may well harbor lingering regrets about the tactics you’ve used to win races. If you’ve worked in national politics at almost any point in the last forty years, chances are things got worse, not better, on your watch. That can gnaw at you.