It has to do with representation Cal. I realize many Christians are very casual in their belief, but there are also many others who would like to see children pray in school and learn that carbon dating doesn't work and the world could be 6 thousand years old.
If the US were to get a president that sympathized with these opinions, imagine the kind of change that could happen in a short time. Young Earth Creationists get pretty damn far on the ignorance and/or sympathies of their local politicians, imagine what they would do with a well meaning President that either didn't understand the issue but sympathized with the Religious, or actively wanted to help them.
I'm not saying it's throwing the gates of hell open on the country, but it's a foot in the door.