As a good liberal who remembers exactly where I was (U of Rochester library) when I heard about JFK's assassination, I've always been a supporter of gun control. And as someone who trusts authority, mostly, I bought the idea the Second Amendment related to militias. Then, in recent years, scholars have made the argument that it really pertains to individual rights. And enough have made that case, and as I've lived and crime has decreased, I've come to accept the idea that there might be an individual right to weapons. (Looking at the Young Irelanders has also been interesting.) You might say I've learned a better interpretation of the Second Amendment.
But then, via Althouse, I stumbled on this site, which quotes the discussion in the House of Representatives on the Second Amendment. Nothing there about individual rights. (I realize that's not a clinching argument, but it certainly causes me to question my recent learning.