After three decades of Mubarak rule, a window of opportunity has opened for various political forces — from the moderate to the extreme — that preferred to keep the spotlight on the liberal face of the demonstrations while they maneuver from behind. As the Iranian Revolution of 1979 taught, the ideology and composition of protesters can wind up having very little to do with the political forces that end up in power. Egypt’s Muslim Brotherhood (MB) understands well the concerns the United States, Israel and others share over a political vacuum in Cairo being filled by Islamists. The MB so far is proceeding cautiously, taking care to help sustain the demonstrations by relying on the MB’s well-established social services to provide food and aid to the protesters. It simultaneously is calling for elections that would politically enable the MB. With Egypt in a state of crisis and the armed forces stepping in to manage that crisis, however, elections are nowhere near assured. What is now in question is what groups like the Muslim Brotherhood and others are considering should they fear that their historic opportunity could be slipping.