Since you didn't read the article, Will's point is that pushing ID will split off a few percent of the party that won't tolerate ID.
Since teaching ID is not some kind of a conservative litmus test, and won't even gain religious fundamentalists anything really important, why push it? It's irrelevant to the Conservative agenda for government.
Those few percent that will leave if ID/creationism becomes associated with Republicans will cost the next presidential election. Is having a Howard Dean or John Kerry elected president worth getting ID into a few schools?
Perhaps - just perhaps - those radical fringe who wanted a little sticker mentioning that the theory of evolution is, ahem, a "theory" - are not the cause of the disruption, whatever disruption there is.
ID and creationism (ie Biblical) are not, not, not the same thing. I am a flagrant disbeliever in the TOE and I also do not believe in Biblical creation. But I have no objection to anyone who believes in literal Biblican creation, nor am I afraid or agrieved if people believe it, or even if children hear it. I am fine if others believe it. It doesn't hurt me one iota. In fact, at least Biblical creationists know that the whole shebang is not a mindless, soulless accident with no purpose or meaning.
There is no reason at all that the TOE cannot be taught, and then some of the actual scientists who don't agree with every jot and tittle of the TOE can be cited or quoted, so that kids learn the pros and cons.
But no, the evofundies cannot allow even a hint of a breath that maybe somehow, somewhere an actual scientist swerves from the catechism of evolutionary theory taught as absolute truth.