What is the Biblical basis for binitarianism?

We hear a lot at times in church, seminary, general discussions, etc about the godhead, so that got me to wondering: what is the Scriptural basis for the Christian doctrine of Binitarianism? **UPDATE:** Binitarianism, as I currently understand it and am currently inferring about, is the belief that the Father and the Son are two persons in one God (similar to the theory of the trinity being 3 persons in one God) and the Holy Spirit is the operational power of God, but not a person.