http://www.kansascity.com/2012/01/14/3371383/missouri-bill-would-require-the.html
Proponents of intelligent design believe the world is so complex that there had to be a designer. Most of them believe the designer is God.
So if the world is so complex that there had to be a designer, it's pretty apparent that the designer itself would have to be remarkable complex itself to conceive of and execute the blueprint for the universe, which by the logic of Intelligent Design dictates that it too must have a designer, which would also have a designer, etc., and now you've got an infinite recursion.
If one argues God is the end point of the recursion, then one argues that an entity with the complexity of the universe can exist without a designer, thereby contradicting the basic premise of Intelligent Design.
Keep this bullshit out of my kid's school.