As an evilutionary biologist, I found Obama's statement on creationism to be particularly heartening, "I believe in evolution, and I support the strong consensus of the scientific community that evolution is scientifically validated. I do not believe it is helpful to our students to cloud discussions of science with non-scientific theories like intelligent design that are not subject to experimental scrutiny."
I don't really know what McCain stands for. Nature reports, "McCain said last year, in a Republican primary debate: “I believe in evolution. But I also believe, when I hike the Grand Canyon and see it at sunset, that the hand of God is there also. In 2005, he told the Arizona Daily Star that he thought “all points of view” should be available to students studying the origins of humanity. But the next year a Colorado paper reported him saying that such viewpoints should not be taught in science class."
Nature's editors teams note, "The most worrying thing about a McCain presidency is not so much a President McCain as a Vice-President Palin. Sarah Palin, Alaska’s governor and McCain’s running mate, opposes all research into human embryonic stem cells. She is a creationist. And until lately, at least, she has been a skeptic of human-created climate change — a disquieting thought."