Why Do Catholics Pray to Saints?

Why do Catholics pray to saints is a FAQ among non-Catholic Christians. I just read a book, Any Friend of God's in a Friend of Mine that is a Biblical explanation of why we do so. In short, we are all part of the Body of Christ, scripture says that we are, and that doesn't exclude those in heaven. We are urged to intecede for each other and that branch of the family isn't excluded. The author, Patrick Madrid also takes on other questions like the use of relics, Purgatory and statues and images. It's a quick, easy informative read, and now it is on my Bookmooch list.