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President Obama travels to Colorado Wednesday to push for gun control, and to Connecticut next Monday for another such event 鈥� both aimed at getting Americans to pressure Congress to act on gun legislation.

Each state has witnessed some of the most horrific mass shootings in US history 鈥� two of them in Colorado 鈥� and has enacted (in the case of Colorado), or is about to enact (in the case of Connecticut), stricter limits on access to firearms and ammunition.

鈥淚t鈥檚 now been just over 100 days since the murder of 20 innocent children and six brave educators in Newtown, Conn., shocked this country into doing something to protect our kids,鈥� Mr. Obama plans to say in Denver, according to excerpts of his remarks released by the White House.

鈥淏ut consider this: Over those 100 days or so, more than 100 times as many Americans have fallen victim to gun violence. More than 2,000 of our fellow citizens, struck down, often just because they were in the wrong place at the wrong time. And every day we wait to do something about it, even more are stolen from our lives by a bullet from a gun.鈥�

The event in Denver and next week鈥檚 in Hartford, Conn., follow last Thursday's emotional plea for action on guns by Obama, flanked by the mothers of young victims, at the White House. The president rejected criticism that he had allowed public support for more gun control to wane as memories of the Newtown massacre have faded. Though his actions that day, and since, suggest otherwise.

Still, the jury is out as to whether this bully-pulpit campaign will help or hurt the president in his ultimate goal: to enact new federal restrictions on access to firearms and ammunition in the name of reducing gun violence.

As public support for more gun control flags, the only hope of rebuilding that support is for the president to take action, suggests Harry Enten, a blogger at the Guardian who focuses on policy and public opinion.

鈥淕un control has gone nowhere in Congress, while the president was saying little,鈥� Mr. Enten wrote last week. 鈥淣ationally, public will on the issue is fading. The situation for gun control advocates could hardly be worse, in fact.

鈥淭he flipside, though, is that by speaking, Obama can engage and activate a public that is still firmly in favor of background checks. He just might be able to change the dynamic and make politicians recognize that, politically, they are on the wrong side of the issue.鈥�

Obama鈥檚 original hope for new gun control included a renewed ban on military-style assault weapons and high-capacity ammunition magazines. And while he insists he hasn鈥檛 given up on those aspects, he is now placing more emphasis on expanding background checks for gun buyers 鈥� a measure for which public support is still above 80 percent.

But there鈥檚 a potential downside to the president鈥檚 renewed campaign on gun control: By putting himself out there so publicly on the issue, he risks stirring up and strengthening opposition, Enten adds.

鈥淭he president could simply polarize the debate even more,鈥� he writes. 鈥淭his campaign may make red state Democrats even more squeamish, and will almost certainly make the Republican-controlled House even less likely to move towards more regulation.鈥�

Senior White House adviser Dan Pfeiffer expressed confidence Wednesday that gun legislation would make it through Congress.

"People here in Washington may be getting cold feet," Mr. Pfeiffer told Mike Allen at a Politico 鈥淧laybook鈥� breakfast. But, "I think on a whole host of issues Washington tends to be a lagging indicator on public opinion."

He added that he was 鈥渟till very optimistic鈥� that a bill would reach the president鈥檚 desk.

"Are we going to get every single Democrat鈥檚 vote? Absolutely not," he said. Pfeiffer acknowledged that Republicans could block the legislation, though they would face 鈥渟ignificant consequences,鈥� including potentially losing control of the House.

On Capitol Hill, aides to Senate Republicans complain that Obama could be doing more to reach out to key lawmakers, including Democrats from Republican states who are up for reelection next year, according to press reports. Democrats need 60 votes to overcome a filibuster in the Senate.

The White House rejects such criticism.

鈥淲e remain engaged in conversations with the Senate and those senators who are interested in forging a bipartisan compromise on measures to reduce gun violence,鈥� White House press secretary Jay Carney said on Tuesday.

Next week, Obama will have dinner with Senate Republicans, the second such dinner in recent weeks, as part of his 鈥渃harm offensive鈥� to warm up relations with lawmakers.聽