Steven Levitsky and Daniel Ziblatt: Democracy’s assassins always have accomplices

During the first Republican debate of the 2024 presidential primary campaign last month, Donald Trump’s rivals were asked to raise their hands if they would support his candidacy, even if he were “convicted in a court of law.” Mr. Trump’s effort to overturn the 2020 election wasn’t just a potential criminal offense. It also violated the cardinal rule of democracy: Politicians must accept the results of elections, win or lose.