I accuse the Discovery Institute of using liberal tactics, and they are.
The whole premise of DI is to use PR and lawsuits to cram something into the field of science that doesn't belong there. And while they're at it, use the associated publicity to bring in donations to a non-profit organization in order to make a living while "making the world a better place". It's a nice scam.
That's exactly what Greenpeace, the Sierra Club, and innumerable other lefty organizations do for a living.
What lawsuits?
In Epperson v. Arkansas, 393 U. S. 97 (1968), we invalidated a statute that forbade the teaching of evolution in public schools; in Edwards v. Aguillard, 482 U. S. 578 (1987), we invalidated a statute that required the teaching of creationism whenever evolution was also taught; today we permit a Court of Appeals to push the much beloved secular legend of the Monkey Trial one step further. We stand by in silence while a deeply divided Fifth Circuit bars a school district from even suggesting to students that other theories besides evolution— including, but not limited to, the Biblical theory of creation— are worthy of their consideration. I dissent. --- Scalia, TANGIPAHOA PARISH BOARD OF EDUCATION ET AL. v. HERB FREILER ET AL., 2000