Conservatives enjoyed extra helpings at the all-you-can-eat schadenfreude buffet when leftists at Princeton made the astonishing discovery that Woodrow Wilson was a racist and demanded that his name be struck from Princeton’s well-known school of public affairs. Wilson’s racism and other unappealing traits have long been well known among conservatives but came as news to the liberal ignorati.

The revisionist literature on Progressivism and the New Deal, once the near-exclusive province of conservative authors and a few eclectic economic historians, has been “going mainstream” for quite a while. The old narrative of brave and altruistic Progressive reformers’ taking on “monopolist robber-baron …