The people who came out to vote in 2018 — in particular young people, women, working people, and people of color — were hoping to elect representatives who would champion their interests. They were looking for someone to start fighting against the corruption that has overtaken Washington, enriching very few at the expense of almost everyone else. Mr. Trump is only the most acute symptom of that corruption. But if Democrats want to be those champions for the American people, they must start by taking him on directly. Only after we restore faith in the rule of law can we begin to tackle other important issues—like improving our healthcare system, guaranteeing clean air and clean water, providing great public education to all, paying workers a living wage, and ensuring everyone has an equal vote.