What to teach in science class?

In 2005, John McCain felt that all points of view should be thoroughly presented:

Daily Star: Should intelligent design be taught in schools?
McCain: I think that there has to be all points of view presented. But they've got to be thoroughly presented. So to say that you can only teach one line of thinking I don't think is - or one belief on how people and the world was created - I think there's nothing wrong with teaching different schools of thought.
Daily Star: Does it belong in science?
McCain: There's enough scientists that believe it does. I'm not a scientist. This is something that I think all points of view should be presented.

In 2006, he said that creationism did not belong in science class:

In the final question of the evening, an audience member asked McCain to outline his stance on teaching evolution and creationism in schools.

"I think Americans should be exposed to every point of view," he said. "I happen to believe in evolution. ... I respect those who think the world was created in seven days. Should it be taught as a science class? Probably not."

In 2008, he decided that it's up to the schoolboard, and he doesn't know what he would do:

Q: How do you feel about teaching evolution in schools?
Mr. McCain: I think, first of all, it’s up to the school boards. That’s why we have local control over education. So my personal view is that children should be exposed to as much as they possibly can so that they can make their decisions and be the best informed. But I really believe that school boards are elected in order to make a lot of those decisions, and I respect their decisions unless they are unconstitutional in some way or, you know.
Q: If you were on a school board, how would you vote?
Mr. McCain: I don’t know, Adam. I’d have to see the proposal, I’d have to see where it lies in the curriculum, I’d have to – I can’t. I’m not running for school board.

Are these positions contradictory? Not exactly, except that he seems to know less and less about his own beliefs over time. If you asked him about it right now, do you know how he would answer?