The day began with the Stoneman Douglas family in a hotel ballroom, eating breakfast, making signs.
Junior Sid Fisher explained his sign.
"Their 17 votes, you never know, they could have made a change," said Fisher.
Then hundreds of MSD students, parents, and teachers took to the streets of Washington, DC.
"It's crazy, never though I would be here," said Junior Kayla Schaefer. "Obviously guns are the problem and people are the problem."
Her best friend Hannah joined her.
"I knew Helena Ramsay, brilliant young lady," said Hannah Betts.
Corinne Small is a senior at Douglas. She marched for her two classmates Meadow Pollack and Ramsay.
"No child should be afraid of going to school and no parent should ever fear seeing their child for the last time," said Small.
Stoneman Douglas lead the charge with hundreds of thousands behind them.