Democratic lawmakers turned out in force on Saturday as hundreds of thousands of protesters gathered in cities across the country to call for an end to gun violence.

At "March for Our Lives" rallies across the U.S., congressional Democrats joined in calls demanding swift action on gun control more than a month after a deadly school shooting in Parkland, Fla., lent momentum to the debate over firearms.

During stops in Boston, Springfield and Worcester, Mass., Sen. Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) marched with students and documented the rallies on her Twitter account.

I’m honored to fight alongside these students in Boston to stop gun violence in our schools. #MarchForOurLives pic.twitter.com/3OA9CC4VwQ — Elizabeth Warren (@elizabethforma) March 24, 2018

Glad to see so many students taking to the streets in Boston this morning to make their voices heard. #MarchforOurLives pic.twitter.com/dR3ur5O7QT — Elizabeth Warren (@elizabethforma) March 24, 2018

Surprise stop in Worcester to thank our student #MarchForOurLives organizers! pic.twitter.com/NkD8kuCis0 — Elizabeth Warren (@elizabethforma) March 24, 2018

Here in Springfield, MA — the home of Smith & Wesson — people are here to say enough is enough. #MarchForOurLives pic.twitter.com/i6J1v9Uu8X — Elizabeth Warren (@elizabethforma) March 24, 2018

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Sen. Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (D-Md.) joined protesters on Saturday in Washington, the epicenter of the rallies, where he told The Hill that attendance topped that of President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's inauguration.

"I can tell you for sure, it's larger than the Trump inauguration."

Sen. Richard Blumenthal (D-Conn.), who attended rallies across Connecticut on Saturday, offered an assessment of the gun control movement, writing on Twitter that the current debate over firearm restrictions appeared poised to result in action.

"This is what democracy looks like - and what America looks like, at its best. This time feels different, because activists across the nation were registering voters, not just making speeches. And they will vote," he said.

This is what democracy looks like - and what America looks like, at its best. This time feels different, because activists across the nation were registering voters, not just making speeches. And they will vote. #MarchForOurLives — Richard Blumenthal (@SenBlumenthal) March 24, 2018

And in Atlanta, Rep. John Lewis John LewisThe Hill's Campaign Report: Biden goes on offense Congress must bolster voting rights and invest in the protection of our election system Ginsburg to lie in state in Capitol on Friday MORE (D-Ga.) touted his 'F' rating from the National Rifle Association (NRA), saying he would be happy to "flunk out of the NRA university over and over again."

"You know the NRA gave me an 'F,' and I'm proud, I'm proud to wear that 'F,' " he said. "So on the Democratic side of the House of Representatives, many members of Congress are wearing an 'F.' "

The "March for Our Lives" was planned by the Marjory Stoneman Douglas High School students who survived a shooting in February that left 17 dead and 14 others injured.

Since then, lawmakers have found themselves on the receiving end of political pressure from students, who have emerged as some of the most vocal advocates for tightening gun restrictions.

Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.), who is facing a potentially tough reelection bid this year, appeared at the march in Washington on Saturday, where he vowed to push for universal background checks for gun buyers and crack down on assault-style weapons like the one used to carry out the attack in Parkland.

"I'm marching for everyone that has had their lives cut short or forever changed by gun violence. I'm marching for the children who are too young to go to school yet. And I'm marching for everyone who doesn’t want to live in fear," Nelson tweeted. "I'm marching for their lives."

I'm marching for everyone that has had their lives cut short or forever changed by gun violence. I'm marching for the children who are too young to go to school yet. And I'm marching for everyone who doesn’t want to live in fear. I'm marching for their lives. #MarchForOurLives — Bill Nelson (@SenBillNelson) March 24, 2018

Great meeting some students ahead of the march. They are strong. #MarchForOurLives pic.twitter.com/ZJLyayi4rW — Bill Nelson (@SenBillNelson) March 24, 2018

Great to see Superintendent @RobertwRuncie! Grateful for the work he is doing in Broward County. #MarchForOurLives pic.twitter.com/0BSWio9WT7 — Bill Nelson (@SenBillNelson) March 24, 2018

Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.), who is also facing reelection in a state won by Trump in 2016, turned out to a march in St. Louis, where she praised turnout among young people.

"So many people. So much passion. Honored to be part of it. Proud of all the young people whose voices are rising," she wrote on Twitter.

So many people. So much passion. Honored to be part of it. Proud of all the young people whose voices are rising. #STL #MarchForOurLives pic.twitter.com/a0FgvotpMu — Claire McCaskill (@clairecmc) March 24, 2018

The protests on Saturday were bolstered by some of the Democratic Party's most recognizable voices, notably former President Obama, who tweeted a message of solidarity for students participating in the marches.

"Michelle and I are so inspired by all the young people who made today’s marches happen," he wrote. "Keep at it. You’re leading us forward. Nothing can stand in the way of millions of voices calling for change."

Former Democratic presidential hopeful Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE also weighed in on the "March for Our Lives," praising the student-led efforts as a "reminder of what is possible when our future is in the right hands."

"Listening to the students from Parkland and across the country today is a reminder of what is possible when our future is in the right hands, and when we match inspiration with determination," she tweeted.

Listening to the students from Parkland and across the country today is a reminder of what is possible when our future is in the right hands, and when we match inspiration with determination. https://t.co/fhiEBIw15B — Hillary Clinton (@HillaryClinton) March 24, 2018

And former Vice President Joe Biden Joe BidenJoe Biden looks to expand election battleground into Trump country Trump puts Supreme Court fight at center of Ohio rally Special counsel investigating DeVos for potential Hatch Act violation: report MORE, a potential contender for the White House in 2020, surprised rallygoers at a "March for Our Lives" event in his home state of Delaware. He delivered remarks at a protest in Wilmington, where he praised students for resurfacing the debate over gun control.

"What's happening now is you're ripping the Band-Aid off," he said. "You're forcing people to look squarely in the eye what they don't want to face."