Photo: Chip Somodevilla/Getty Images American presidential elections are binary. Either a Democrat or a Republican wins. Nobody else. The 2024 presidential election will be between Joe Biden and Donald Trump. No matter how much Americans may wish for other candidates, that’s the choice. Third-party candidates don’t win, can’t win; they only steal votes from the mainstream Republican or Democratic candidate with whom they are most closely aligned. They help the candidate at the opposite end of the political spectrum. This year, progressives who vote for a third-party candidate, or don’t vote at all, are really voting for Trump. In 1992,...