But with Reid wary of exposing Democratic senators facing tight re-election contests in some conservative and Western states to politically risky votes — and the Republican-run House showing no appetite to restrict guns anyway — people aren't holding their breath waiting for proposed gun restrictions to reach the Senate floor before Election Day.
"This kind of change doesn't happen overnight," said Dan Gross, president of the Brady Campaign to Prevent Gun Violence. "There are obviously a lot of other considerations and variables in play here, like elections."
Klobuchar's bill on stalkers would play into Democrats' campaign-season theme of pushing legislation that appeals to women, a key Democratic voting bloc. She said Tuesday she has discussed her legislation with Reid but didn't ask about holding a vote because she's first trying to round up Republican support to make the measure bipartisan.
Democratic caution on the gun issue has been displayed several times recently, even as the December 2012 killings of 20 children and six adults at an elementary school in Newtown, Conn., that fanned interest in firearms restrictions fade further into the past.
The September 2013 shooting deaths of 12 people at the Washington Navy Yard and this month's slaying of three people outside Jewish community centers in Overland Park, Kan., were greeted with no fresh Democratic legislative pushes. And in the face of National Rifle Association opposition last month, the White House paused its effort to push its surgeon general nominee through the Senate — Dr. Vivek Murthy, a Harvard Medical School physician, Obama political organizer and gun-control supporter.
"They're waiting for another tragedy to exploit," Chris Cox, the NRA's chief lobbyist, said of the Senate hiatus on gun activity. "The question is, do they want gun owners across this country to be more enraged this election cycle than they're already going to be?"
White House officials say they've not abandoned the issue. They cite 23 executive orders Obama issued last year, including restarting federal research on gun violence, plus additional steps like starting to close a loophole that let some felons get machine guns by registering them to trusts or corporations.
"We're just going to keep pushing until Congress does the right thing," presidential adviser Valerie Jarrett told gun-control activists last week.
As the issue has ebbed in Congress, it has accelerated in the states, where legislatures are debating hundreds of gun-related bills, some weakening and others strengthening restrictions.
Meanwhile, powerful groups are revving up for the fall elections.
Former New York Mayor Michael Bloomberg, a billionaire and advocate of firearms curbs, plans to spend $50 million this year setting up a new group that will mix campaign contributions with field operations aimed at pulling gun-control voters to the polls.
The new organization, Everytown for Gun Safety, will focus on women, especially mothers, and work on state and federal elections, the group said Wednesday.
Bloomberg said Wednesday on NBC's "Today" that his group will reward candidates "who are protecting lives, and make sure that those who are trying to keep people from being protected lose elections."
Also planning campaign activity this year is Americans for Responsible Solutions, a gun-control group headed by former Rep. Gabrielle Giffords, D-Ariz., and her husband, ex-astronaut Mark Kelly. The group reported late Tuesday that its political committee has raised nearly $14.5 million since it was founded in January 2013, and it plans to spend its money on federal and state races, said spokesman Mark Prentice.
Giffords was severely wounded in a Jan. 8, 2011, shooting rampage that killed six people.
The National Rifle Association spent nearly $20 million on federal campaign activity in 2012 races. Its true strength is viewed as its claimed 5 million members, many of whom consider gun issues strongly when voting.