More importantly, they're not going to be embarrassed at the polls because, contrary to the desires of some of the squawkers here, they aren't dumb enough to make pushing ID an issue come election time. Why? Because it doesn't play in Peoria. Just ask Santorum.
Complain all you like, but if it ever becomes a real, live issue in a major campaign, that "huge constituency" is not going to be nearly huge enough - in fact, they'll take on the role of ball-and-chain tout suite.
Or, maybe their little bully-ing pulpit. I remember my early ed with evo (middle school) when the growing human embryo was sited as evidence of the Truth of evo. Gills, like a mudfish! Amphibian vestiges! Resemblence to a primate! I dutifully hid my snorts. What does looking like something have to do with anything? What kind of evidence was that? I can draw a fish, but it won't swim. This was the same class that had the artist's rendering of the monkey (with a tail) progressing upward, through the Neandertal, to a guy in a suit who looked a lot like George Will.
Later, there was a real embryology class that didn't give a flip about the theory of evo--it was just straightforward, because the students needed to know about embryos rather than the ideology of the teacher. At once the irrelevance of the previous evo-obsessed teacher became clear. That embryo folded in half in development, folded inside itself. What would become one organ emerged and gravitated to its proper place--another crossed it's path. And the most amazing thing about organisms--it formed this communication system of chemicals, of hormones that told each organ how to grow and behave. Of all the marvels of life, this system of organs talking to one another, working together, is the most remarkable of all. All this, from a genetic program. It happens to every other fertilized egg--succeeds half the time. A dance of life.
Evolution was not discussed. People were too busy learning about life.