As a powerful grassroots movement emerges, some want to use it for their own gain. The history of the Tea Party has important lessons on how to avoid that. The fury currently welling up against our demagogue president is a gorgeous thing. The Women’s March on Washington bowled me over by its sheer numbers. The town hall meetings calling Republican representatives to account are delicious payback for decades of phony populism. The combination of the two is one of the healthiest political developments I have seen in many years.