The people who live and breathe politics often talk as if the upcoming election is the most important election of all time. As they see it, we are in an unprecedented historical moment and the choices we make today will determine the fate of the nation. I understand their perspective and a younger version of me occasionally slipped into that mindset. However, far from being unprecedented, the core challenge facing America today was described more than 2,000 years ago by an ancient Greek philosopher. Plato, a student of Socrates and teacher of Aristotle, imagined prisoners chained inside a dark cave,...