Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A wonderful, well-researched read

This is a great book. It is not only well-researched, but also witty, insightful, and a very engaging read. It's impressive how accessible Graff has made this material; there's a lot of very detailed information packed into a small book, but it's never dry or difficult to read. Her arguments in favor of same-sex marriage are thoughtful and very well-reasoned -- I now feel much better prepared for discussing same-sex marriage with family and friends.