Civil rights veteran and Georgia lawmaker John Lewis of Georgia, said: "We are going to win this struggle."
Earlier today, Republican Speaker Paul Ryan tried to regain control of the house but was met with chants of “no bill, no break”.
As the sit-in entered its 10th hour, Democrats began camping on the floor with sleeping bags, pillows, blankets and ate doughnuts that were shipped in.
When Mr Ryan stepped to the podium to take back control and hold votes on routine business, angry Democrats shouted and waved pieces of paper with the names of gun victims.