If the triumph of Trumpism is the most important recent development in American political history, then the second most important is the mobilization of liberal and left-wing voters to challenge the president’s authoritarian politics.

This mobilization drove the Women’s March, where a day after Trump’s inauguration, hundreds of thousands came to Washington to protest against his nascent administration. Millions of others joined them in cities across the country — a remarkable demonstration of opposition to a new president. It stiffened Democratic resolve to oppose the president at a time when some of the party’s leaders were looking for bipartisan cooperation. It helped halt the Republican drive to repeal the Affordable Care Act — peeling critical support away from Mitch McConnell, the Senate majority leader — and last year powered an electoral wave that gave the Democratic Party its first majority in the House of Representatives since 2010.

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