What is Alvin Plantinga's view on divine sovereignty and free will?

The main Wikipedia page on Molinism lists Plantinga as one of its (Molinism's) best known advocates. However, Plantinga, in a speech given at Azusa Pacific University, describes himself as "a Calvinist, of a certain kind" (https://www.youtube.com/watch?v=4UDnOcS20HM 30:55). Does anyone familiar with Plantinga's work know exactly what his view is, whether it is a hybrid, or has changed from Calvinism to Molinism (or vice-versa) over time? I am interested in whether he is mainly in agreement with William Lane Craig on this matter, or actually has a more Calvinistic worldview, and if the latter, if and how he has defended this view against objections similar to Craig's (http://www.reasonablefaith.org/molinism-vs-calvinism) . Of course, I would not expect him to have engaged Craig himself, but certainly these arguments against Calvinism have been around for some time. It goes without saying that such a defense could have relevance in the life of a Christian contemplating the truth of these views.