The Second Amendment to the U.S. Constitution says:

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

For generations, the Supreme Court has interpreted this to mean there is a right to keep and bear arms in the context of a “well-regulated” militia.

Today in a 5-4 ruling, Republican-appointed Supreme Court judges finally gave the National Rifle Association and other gun advocates what they’ve been seeking for decades: an opinion that says the Second Amendment implies an individual right to keep and bear arms.

In the process, they invalidated a Washington, DC statute banning handguns and requiring trigger-locks on other guns.

There’s a lot of legal commentary on this ruling at the SCOTUSblog and at The Volokh Conspiracy blog.

Here are some other posts on the ruling:

Jeralyn at Talk Left (an attorney)

Adam B at Daily Kos (also an attorney)

Dahlia Lithwick at Slate (this includes an observation that Justice Scalia, who wrote today’s ruling, recently dissented to a court ruling on the rights of Guantanamo detainees by saying it “will almost certainly cause more Americans to be killed.”)