The issue of gun control is a hot topic at the White House and in 100 major cities across the U.S. today. As lawmakers debate legislation, citizens are demanding action.

Michele Zelazny still can't shake the tragedy that took place in Sandy Hook, Connecticut. She stands in Cleveland's Public Square gathering signatures for stricter gun control laws on the same day a report was released that gunman Adam Lanza fired 155 shots in a matter of 5 minutes.

She's working with "Mayors Against Illegal Guns," a group supporting tougher gun restrictions and also behind ads are airing in 13 states, along with the group, "Demand Action."

But Cleveland is one of 10 television markets targeted by Mayor Michael Bloomberg in this gun control ad blitz, mainly to grab the attention of Senator Rob Portman.

"We're not sure he's going to support this criminal background check for all gun sales," says Zelazny.

He's voiced opposition to some points in the past. And senators separated the proposed assault weapons ban from another bill requiring universal background checks and stricter penalties for gun trafficking.

"At some point, we have to address the issue of just too many weapons," says gun violence victim Nathan Bozeman, who signed the petition.

He believes the time is now to act, no matter what your opinion.

"No one is trying to take anybody's constitutional right to possess or bear arms, but there comes a point in time when you got 17-year-olds, 16-year-olds, 15-year-olds getting caught with guns in schools," says Bozeman.

The group "Demand Action" wants to close loopholes that allow gun sales at gun shows, ban assault weapons from neighborhoods and make gun trafficking a federal crime.

But most of all, they want to create a universal background check for anyone wanting to buy a gun.