Finding Great Teachers

We're about to have some candidates come to campus for an opening we have. Finding someone who will become a solid scholar is fairly straightforward. In conversation you can get a sense of the breadth and creativity. In writing samples, you get a sense of rigor. From the cv you get a sense of progress.

But we are hiring a teacher. What do you look for in a teaching demonstration that shows you have someone who will be wonderful in the classroom? What are the marks of a good teacher? of a great teacher? What little things show you that the person in front of you possesses pedagogical excellence?