Huckabee’s answer was laced with important misconceptions about science. Perhaps the most insidious problem with his response is that it plays on our sense of democracy and free expression. But several court decisions have concluded that fairness and free expression are not violated when public school teachers are required to teach the approved curriculum. These decisions recognized that teaching creationism is little more than thinly veiled religious advocacy.

Long, but the basics are, schools ignore the what the state says is the curriculum because if they don't the fundamentalists go nuts.