ETA: Just found the latest news on this:
Evolution wins a round in Texas education debate (23 January): "Board members voted eight-to-seven last night to drop controversial language in the state's curriculum that requires science teachers to discuss the “strengths and weaknesses” of scientific theories."
In Texas, a Line in the Curriculum Revives Evolution Debate (22 January)
Briefly put, Creationists want long-refuted "weaknesses" in the Theory of Evolution taught in the classroom, such as the well-worn claim that the
Cambrian Explosion is a mystery impenetrable by science.
ETA: As
Scientific American notes, each time Creationists are defeated in their efforts to get religion into science classes, they change tactics; the claim that evolution is controversial and that they're defending academic freedom is just the latest one.