Last spring, in The New Statesman, Samuel Moyn reviewed Revolutionary Spring, Christopher Clark’s massive new history of the revolutions of 1848. Like most everything Moyn writes, the review was witty, insightful, and provocative — another illustration of why Moyn has become one of the most important left intellectuals in the United States today. One thing about it, though, puzzled me. In the Carlyle lectures that he delivered at Oxford the year before, now published as Liberalism Against Itself, Moyn argued that liberalism was, before the Cold War, “emancipatory and futuristic.” The Cold War, however, “left the liberal tradition unrecognizable and in ruins.” But in the New Statesman review, Moyn claimed that liberals had already lost their way a century long before the Cold War. “One lesson of Christopher Clark’s magnificent new narrative of 1848,” he wrote, “is a reminder of just how quickly liberals switched sides…. Because of how they lived through 1848, liberals betrayed their erstwhile radical allies to join the counter-revolutionary forces once again — which is more or less where they remain today.”