A couple of days ago, I mentioned offhandedly that "originalism" and "textualism" are not the same thing. Then I moved on. A couple of readers have asked me to expand on this. What's the difference between an originalist and a textualist? I'll start with a brief history, then the formal differences, and then a word on common usage... because, in common usage, "originalism" and "textualism" are pretty much interchangeable. I'll explain why that is, and why it's not a problem as long as you know what's going on.