We are well aware of the Republican war on science from the eponymous 2006 book (Basic Books) by Chris Mooney, and I have castigated conservatives myself in my 2006 book Why Darwin Matters (Holt) for their erroneous belief that the theory of evolution leads to a breakdown of morality. A 2012 Gallup Poll found that “58% of Republicans believe that God created humans in their present form within the last 10,000 years,” compared with 41 percent of Democrats. A 2011 survey by the Public Religion Research Institute found that 81 percent of Democrats but only 49 percent of Republicans believe that Earth is getting warmer. Many conservatives seem to grant early-stage embryos a moral standing that is higher than that of adults suffering from debilitating diseases potentially curable through stem cells. And most recently, Missouri Republican senatorial candidate Todd Akin gaffed on the ability of women’s bodies to avoid pregnancy in the event of a “legitimate rape.” It gets worse.

Whereas conservatives obsess over the purity and sanctity of sex, the left’s sacred values seem fixated on the environment, leading to an almost religious fervor over the purity and sanctity of air, water and especially food. Try having a conversation with a liberal progressive about GMOs—genetically modified organisms—in which the words “Monsanto” and “profit” are not dropped like syllogistic bombs. Comedian Bill Maher, for example, on his HBO Real Time show on October 19, 2012, asked Stonyfield Farm CEO Gary Hirshberg if he would rate Monsanto as a 10 (“evil”) or an 11 (“f—ing evil”)? The fact is we’ve been genetically modifying organisms for 10,000 years through breeding and selection. It’s the only way to feed billions of people.

Surveys show that moderate liberals and conservatives embrace science roughly equally (varying across domains), which is why scientists like E. O. Wilson and organizations like the National Center for Science Education are reaching out to moderates in both parties to rein in the extremists on evolution and climate change. Pace Barry Goldwater, extremism in the defense of liberty may not be a vice, but it is in defense of science, where facts matter more than faith—whether it comes in a religious or secular form—and where moderation in the pursuit of truth is a virtue.