At Secular Right, Bradlaugh (John Derbyshire) writes:

I insist that ideologues on both sides are science-hostile; but which kind of politics is more of an obstacle to the advance of our understanding, is arguable. Since science is mostly carried out in places where Right Creationists, Geocentrists, etc. have no influence, but blank-slate Left “culturists” and po-mo words-have-no-meaning deconstructionists have tremendous influence, I’d guess the Left has the potential to do more damage, at least in the human sciences.

This strikes me as about right, at least in terms of the research taking place in institutions of higher learning. In lower education, I suspect both can do damage, depending on where you are–your kid can be taught anything from Intelligent Design to “culturalist” claptrap.