David Hogg, a 17-year-old student at Marjory Stoneman Douglas, has also become a national face of the anti-gun violence movement. Hogg has given multiple national media interviews and spoken at several events in the wake of the shooting.
On Saturday, Hogg encouraged the crowd to take action and vote.
"We're going to make sure the best people get in our elections to run not as politicians, but as Americans. Because this — this — is not cutting it," he said.
Some of President Donald Trump's most fervent supporters, gun rights activists, and alt-right bots have attacked Hogg, along with other Parkland survivors, online. High profile members of the conservative media, who disagaree with Hogg's support for gun control, have called him an "extremist" and a "useful idiot."
"We're going to make sure the best people get in our elections to run not as politicians, but as Americans. Because this -- this -- is not cutting it," David Hogg says, pointing to U.S. Capitol https://t.co/jujbxM0M4i #MarchForOurLives pic.twitter.com/FCBU473eT5
— CBS News (@CBSNews) March 24, 2018