The new ads unveiled Tuesday by the super PAC headed by ex-Rep. Gabrielle Giffords, D-Ariz., and her husband, Mark Kelly, are just the latest in a wave of gun-related advocacy and political spending.

Launched as the Senate Judiciary Committee prepares to mark up a series of gun safety measures, the cable TV ads from Americans for Responsible Solutions feature Giffords speaking directly to the camera with the message, “Let’s get this done.” They are running in Iowa and Arizona, home to Judiciary Committee members Charles E. Grassley, R-Iowa; Jeff Flake, R-Ariz.; Tom Harkin, D-Iowa; and John McCain, R-Ariz.

More than a half-dozen groups on both sides of the debate over gun safety have run broadcast ads in major markets or posted TV-ready ads on their YouTube accounts since President Barack Obama called for tougher firearms measures in his State of the Union address in mid-February, according to a Sunlight Foundation analysis. Though overshadowed in recent weeks by budget fights, the gun issue appears to have lost little steam since the December mass shooting at a Newtown, Conn., elementary school.

The groups range from Independence USA PAC , the super PAC launched by New York City Mayor Michael Bloomberg that spent $2.5 million helping Democrat Robin Kelly win a House special-election primary in Illinois, to the National Rifle Association of America Political Victory Fund. Other groups running or posting ads include Mayors Against Illegal Guns, MoveOn.org, the Progressive Change Campaign Committee, and the grass-roots pro-Obama group Organizing for Action, Sunlight reported.

New players continue to pop up. A new political action committee dubbed Americans for the Protection of Children launched last month. The group’s website publishes the NRA’s purported “enemies list” and declares, “I am a proud enemy of the NRA.” Another group launched and run by concerned mothers, originally dubbed One Million Moms for Gun Control, last month renamed itself Moms Demand Action for Gun Sense in America.

The progressive advocacy group Credo Action also has launched several gun-safety-related petition drives and generated more than 9,000 activist calls to senators to urge passage of legislation to ban assault weapons and high-capacity magazine clips. The Credo Super PAC joined with Progressive USA voters on a field campaign to back Robin Kelly in the Illinois primary race.

Gunowner rights organizations have also maintained a high profile. Last month Gun Owners of America hosted an event in the Capitol featuring testimonials from a law enforcement officer opposed to “gun-free school zones.” Next week, NRA President David Keene and Wayne LaPierre, the group’s executive vice president and CEO, will speak at the annual Conservative Political Action Conference, the American Conservative Union announced.

An earlier version of this story incorrectly identified the group previously known as One Million Moms for Gun Control. That group is now Moms Demand Action for Gun Sense in America.