[Keilar:] Back now to our top story, the biggest court ruling on guns in American history. By the narrowest of margins, 5-4, the Supreme Court has ruled that a handgun ban in Washington, D.C., is unconstitutional. And unlike lots of other high court rulings and big-ticket legislation, this one hits members of Congress where they live part of the year, anyway. Now, CNN's Kate Bolduan is gauging the reaction on Capitol Hill. Kate, the decision really receiving some support there.
[Kate Bolduan, Cnn Correspondent:] Yes, it sure is, Brianna. The reaction here has been swift, and it's really unusually atypical for Congress, cuts across party lines. I mean, some lawmakers really applaud this decision, saying it's a triumph for Second Amendment rights. In fact, more than 300 lawmakers signed a legal brief, joined together to sign a legal brief asking the Supreme Court to do just as they did, to strike down the D.C. gun ban. And Republican Senator Kay Bailey Hutchison was one of those signatures.
[Sen. Kay Bailey Hutchison , Texas:] It will put in every law, in every state or local government, a clear delineation of the individual right to keep and bear arms in a person's home.
[Bolduan:] So clearly, as you can see there, some lawmakers and many gun owners are cheering today Brianna.
[Keilar:] Yes, but not everyone happy, by any stretch of the imagine, Kate.
[Bolduan:] No. There was also some outrage here on Capitol Hill. Lawmakers like longtime gun control advocate Democratic Senator Dianne Feinstein, she says she fears that this ruling will have far- reaching fallout, and she says it endangers communities nationwide. Listen here.
[Sen. Dianne Feinstein , California:] As a former mayor who's seen all of this, and I'm not a novice to it, I believe communities are less safe. I believe the District of Columbia is less safe. And we now have to look at where we might be able to go with new legislation.
[Bolduan:] Some people do say they are still reading this ruling, but other than a bill that was signed into law in January that strengthened background checks for gun owners, it's really been over a decade, Brianna, since Congress has passed any significant gun control legislation.
[Keilar:] Kate Bolduan for us on Capitol Hill thanks.
[Lemon:] Well, it used to be that you went into a gun store and you bought a gun, but not so much anymore. And this one is a little bit trickier. That's why we want to talk to our Josh Levs. But first a little background here. Gun laws are different from city to city, right, Josh?
[Josh Levs, Cnn Correspondent:] Yes, sure.
[Lemon:] State to state, but the Internet is the Internet, and who really governs it? Our Josh Levs joins us now to talk about that. Josh, so what is what's the concern here when it comes to that, that people are just going online, upsurge in gun-buying online and what have you, where there really are no rules?
[Levs:] Yes. Look, I mean, the Internet is playing into the easy availability. This news today out of the Supreme Court is really getting a lot of Americans thinking in general about the availability of guns. So that's what we looked at here, is the Internet, and how is that playing out in terms of availability? And you know, Don, I really like to find hard statistics that we can wrap our mind around. There aren't any here. And this in and of itself is a story. There's a reason for that, summed up very well by this quote we found from "The Albany Times Union." Look at this quote here. It says, "The sale of guns on the Internet has increased tremendously, and federal agencies are not equipped to monitor the thousands of sales that authorities estimate take place each year." Now, it says that in most cases the sales are legitimate, sometimes even requiring people to show up, to pick it up, and do background checks. But federal laws primarily scrutinize sales by gun dealers, and there's little regulation of secondhand sales involving many of the estimated get this 230 million guns that are privately owned. So obviously we're talking about a huge marketplace, much of which is unmonitored. And absolutely, these days you've got the Internet, which in a way can scale some of those city or state laws. You all can learn a lot more about this at CNN.com. And while you're there, I want you to encourage you to look at two things here I think are fascinating. First of all, this chart we're showing you here, this is where Americans stand on this issue. Look at this. Americans were asked, "Does the Constitution guarantee every person the right to own a gun?" More than two-thirds there, 67 percent, says, yes, it does. And only 30 percent said no. One more thing I want to show you, too, Don. This is great, and it's historic in a way. This decision today, you can actually go online to our Web site right now and hear the arguments on the different sides. Let's listen in.
[Unidentified Male:] The Second Amendment was a direct response to concern over Article 1 Section 8 of the Constitution. We have here a ban on all guns for all people in all homes at all times in the nation's capital. That, quite simply, is too broad and too sweeping under any level.
[Levs:] There you go. So anyone who wants to know what was said on the different sides, just go to CNN.com, and you're going to be able to hear the arguments on the different sides. And that, by the way, was historic. When they start releasing audio from inside the Supreme Court, this now historic decision, historic day, you can hear the historic sound. Don, there you go, more on all of this and Internet sales of guns at CNN.com.
[Lemon:] You know what I want to know, Josh and if you can get back to us or send me an e-mail and I'll get it on the air here but do you know if more guns I'm thinking it's probably in stores but if more guns are sold online or in stores?
[Levs:] Right.
[Lemon:] And if that's, you know, how the numbers may be changing.
[Levs:] I can answer that now.
[Lemon:] Yes, go ahead.
[Levs:] I mean, because that was one of the main things I was looking for today. And one of the problems is, because it's so unmonitored, there is no trustworthy statistic giving a total. They do know that the number the ratio is kind of moving toward the Internet more and more.
[Lemon:] Right.
[Levs:] But whether it's crossed over so that more overall is from the Internet than from stores themselves, we don't know. And because so much of this is underground, there's almost no way to know.
[Lemon:] There you go.
[Levs:] There you go.
[Lemon:] And we will see how this if this changes anything at all. Josh Levs, really appreciate that. Thank you.
[Levs:] Thanks, Don.
[Keilar:] She was taking on new assignments, both as a soldier and as a mom. And now her death has shocked two communities.