Jon Huntsman Jr., a former Utah governor and ambassador to China, isn’t a serious contender for the Republican presidential nomination. And that’s too bad, because Mr. Hunstman has been willing to say the unsayable about the G.O.P. — namely, that it is becoming the “anti-science party.” This is an enormously important development. And it should terrify us.

Paul Krugman

To see what Mr. Huntsman means, consider recent statements by the two men who actually are serious contenders for the G.O.P. nomination: Rick Perry and Mitt Romney.

Mr. Perry, the governor of Texas, recently made headlines by dismissing evolution as “just a theory,” one that has “got some gaps in it” — an observation that...