It's not the Liberals I worry about appealing to, it's the undecided's and those in the middle.
I have a feeling that the majority of people who have not decided if they're liberal or conservative won't be either put off or attracted by this issue.
There are other issues which are more urgent in peoples' minds. Just MHO.
If someone is thinking about conservative viewpoints, weighing them, and reads some debate about ID versus Darwinism, it's not going to be the pivot point. And so many conservatives are not in the ID camp anyway.
Abortion, "gay" marriage, taxes, the WOT, and borders/illegal aliens are much hotter issues, don't you think?