Have you ever wondered what it means to be an originalist? Ever been confused about the different forms of originalism? Wondered what the best justifications for this approach to interpreting the Constitution are?

In the last 40 years, Originalism has gone from an approach to interpreting the Constitution very much in the minority in the legal academy and in the Courts, to receiving widespread popular discussion.  What is behind that shift?   How has originalism itself changed over that time period?  What are key debates among originalists today?