At his teaching site Chuck McCoy, one of my Bible Doctrine professor at Nebraska Christian College, has an article about God's involvement in the hardening of Pharaoh's heart. Was God responsible or did Pharaoh have a say in the matter? McCoy writes:
The hardening of Pharaoh's heart (Exodus 7:3 - 14:17) has been a topic of discussion for some time. Those who hold a “deterministic” (God controls/manipulates everything) view, argue that God saves who He chooses (totally on His own whim/authority) and hardens and condemns whoever He chooses, regardless of their inclinations, choices or responses.Take some time and read what else my old Bible College professor has to say about the Hardening of Pharaoh's Heart.