"My two older children, of course, are very aware of what's going on and I said, 'I'm going down there, you know, for you, for us, and to make a difference," she said. "Without sounding corny, but I mean, it's just piggybacking on the sentiment of the politicians that are in favor of all this change.

"People as a country, like, we can't keep waiting for all the politicians to make a move," she added.

A small opposing demonstration was held across the street from the gun control advocates' staging area near the Capitol. One gun rights advocate said he thinks people in schools should be armed -- a viewpoint he developed after the Newtown shooting.

"I could not figure out why government employees have armed guards, banks have armed guards to protect the money, but the government, for some reason, thought we don't need armed guards to protect our children," said Dick Heller, who was the lead plaintiff in a 2008 Supreme Court case that overturned a sweeping handgun ban in the nation's capital.

"Maybe they're less worthy. I don't know. I don't know what their thinking was. All I can't understand is why didn't they protect their children like the government protects itself?" Heller added.

The gun control march organizers are also calling on Congress and state legislatures to prohibit the sale of bullets that shatter inside the body and to require gun-safety training for all firearms purchasers.

Among the other placards that demonstrators raised above their heads were: "More guns? More violence" and, in a reference to NRA CEO Wayne LaPierre (who has said "the only thing that stops a bad guy with a gun is a good guy with a gun"): "Hey LaPierre. How about this? Keep the Bad guy from even getting a gun!"