As reported in this article in Reason Magazine:
My favorite response from any candidate about the evolution/creationism debate was from former Sen. Mike Gravel (Alaska). When LiveScience asked the senator if he thought creationism should be taught in public schools, Gravel replied, “Oh God, no. Oh, Jesus. We thought we had made a big advance with the Scopes monkey trial….My God, evolution is a fact, and if these people are disturbed by being the descendants of monkeys and fishes, they’ve got a mental problem. We can’t afford the psychiatric bill for them. That ends the story as far as I’m concerned.”
Knowing you can’t win can be liberating. I suspect that’s how all of the Democratic candidates feel about this issue, but it is only the ones on the fringe who can actually say it.