One of Sanders’s greatest advantages is his stubbornness. Sometime in the 1990s, Americans got used to the idea that politics is entirely phony. It’s all “spin.” All candidates “pivot.” Donald Trump has a very unfaithful relationship with the truth. At the same time, Trump’s character is transparent. People knew what kind of man Trump really was when they voted for him. Sanders’s lifelong adherence to social-democratic politics, his willingness to sit on the margins because of his fidelity to that vision, is his greatest asset. The whole world has grown soft and inconstant. Sanders is a rebuke to that. Republicans and conservatives need to take him very seriously.