DENVER — Tens of thousands of people across the country marched in support of impeachment Tuesday evening, from a demonstration through a rainy Times Square to handfuls of activists standing vigil in small towns around the country.

Liberal groups organized more than 600 events from Alaska to Florida, following a familiar model of mass protest that has come to define the left during the Trump administration. Some of the demonstrators were veterans of other marches, while others were like Glenn Conway of Holly Springs, North Carolina, who was attending his first political rally in 30 years,

“I really believe that the Constitution is under assault. That is not an exaggeration. I think we have a president at this point who believes he’s above the law,” Conway, 62 said.

For all the passion among activists, the gatherings were notably smaller than many of the other recent mass protests that began with the millions-strong Women’s Marches the day after Trump’s inaugural and have ranged over subjects from climate change to gun control.

In San Francisco, Marti McKee, a commercial artist, has been distributing signs and placards to marchers ever since Trump won the 2016 election. She has been struck by how impeachment draws so many fewer people to the streets than other causes.