To watch the Arab world’s political transformation over the past year has been, in part, to track the inexorable rise of Islamism. Islamist groups—that is, parties favoring a more religious society—are dominating elections. Secular politicians and thinkers in the Arab world complain about the “Islamicization” of public life; scholars study the sociology of Islamist movements, while theologians pick apart the ideological dimensions of Islamism. This March, the US Institute for Peace published a collection of essays surveying the recent changes in the Arab world, entitled “The Islamists Are Coming: Who They Really Are.”