Andrew Schlafly of Conservapedia didn't like the results of a scientific paper (that he admitted he hadn't read), so he decided to demand the original data from the paper's author, Richard Lenski.
Dr. Lenski's response is so tempered, educational, and elegant, that I recommend reading the whole exchange (archived at Bad Science to guard against the inexplicable phenomena of disappearing entries that show conservative mouthpieces in their true light).
I've excerpted a couple of my favorite bits on the flip, though.