AUDIE CORNISH, HOST:
Authorities say James Holmes was armed with a modified assault rifle, two pistols, and a shotgun along with thousands of rounds of ammunition. Some lawmakers have spoken out since the killings, calling for strengthening gun control legislation but so far, there hasn't been much momentum behind efforts to keep people from acquiring such arsenals.
For example, Colorado's Democratic governor, John Hickenlooper, said this on CNN.
GOVERNOR JOHN HICKENLOOPER: If there were no assault weapons available, if there were no this or no that, this guy is going to find something, right? He's going to know how to create a bomb. He's going to - I mean, who knows where his mind would've gone.
CORNISH: NPR's Scott Horsley has this story exploring why ambitious politicians have shied away from pushing new gun control measures.
SCOTT HORSLEY, BYLINE: When President Obama met with the families of the shooting victims over the weekend, he said he wanted to let them know all of America is thinking of them.
PRESIDENT BARACK OBAMA: I hope that over the next several days, next several weeks, and next several months, we all reflect on how we can do something about some of the senseless violence that ends up marring this country.
HORSLEY: Mr. Obama didn't elaborate on what that something might be and he said nothing at all about guns. Last year, in the wake of the Tucson shooting spree that killed six people and wounded 13, including Congresswoman Gabrielle Giffords, Mr. Obama penned an op-ed article that basically called for better background checks.
White House spokesman Jay Carney says that's still the president's answer.
JAY CARNEY: He believes we need to take steps that protect Second Amendment rights of the American people but that ensure that we are not allowing weapons into the hands of individuals who should not, by existing law, obtain those weapons.
HORSLEY: But nothing in the president's proposal would have prevented the suspected Aurora gunman from legally buying his guns. Unlike the suspects in Tucson or at Virginia Tech, James Holmes had no documented record of mental illness, as far as we know. Carney says while Mr. Obama supports a renewed ban on assault weapons, he has little hope of passing it.
CARNEY: Well, as you know, there has been opposition to that since it expired within Congress, so the president is focused on doing the things that we can do.
HORSLEY: National politicians in both parties are generally wary of offending the powerful gun lobby. Mitt Romney supported an assault weapons ban as governor of Massachusetts. In this campaign, he says no new laws are needed. It's different in some of the nation's big cities. New York Mayor Michael Bloomberg has been an outspoken advocate of gun control.
After the shootings on Friday, he said Mr. Obama and Romney both need to offer more to the victims than soothing words.
MAYOR MICHAEL BLOOMBERG: Everybody always says isn't it tragic and, you know, I mean, there's so many murders with guns every day. It's just got to stop.
HORSLEY: Bloomberg says if politicians won't take the lead, ordinary citizens may have to.
BLOOMBERG: If it was one of your kids in Aurora maybe you'd stand up and say I'm not going to take this anymore.
HORSLEY: That's what happened to Tom Mauser. His son Daniel was among those killed in Colorado's Columbine massacre 13 years ago. Since then, Mauser has become a gun control activist. But these days he feels as if he's fighting a losing battle.
TOM MAUSER: Obviously, this country has somewhat accepted its fate. It may not be happy with it, but it's just kind of, in a depressing kind of way, has accepted this level of gun violence, decided there's nothing that it can do. There is no single thing you can do. There's no one law that will change this. But that is not a reason for not working on this problem.
HORSLEY: At his nominating convention in Denver four years ago, Mr. Obama cited gun control as one of the areas in where common sense ought to be able to overcome partisan differences.
OBAMA: The reality of gun ownership may be different for hunters in rural Ohio than they are for those plagued by gang violence in Cleveland but don't tell me we can't uphold the Second Amendment while keeping AK-47s out of the hands of criminals.
HORSLEY: Friday's rampage in Aurora and the reaction to it suggest that so far, that middle ground is still elusive. Scott Horsley, NPR News, Denver.
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