"Change We Can Believe In” wasn’t just about a set of policies; it was more grandiose. Obama promised to transcend forty years of demographic and ideological trends and reshape Washington politics. In the past three years, though, he has learned that the Presidency is an office uniquely ill-suited for enacting sweeping change. Presidents are buffeted and constrained by the currents of political change. They don’t control them.
George C. Edwards III, a political scientist at Texas A. & M., who has sparked a quiet revolution in the ways that academics look at Presidential leadership, argues in “The Strategic President” that there are two ways to think about great leaders. The common view is of a leader whom Edwards calls “the director of change,” someone who reshapes public opinion and the political landscape with his charisma and his powers of persuasion. Obama’s many admirers expected him to be just this.
Instead, Obama has turned out to be what Edwards calls “a facilitator of change.” The facilitator is acutely aware of the constraints of public opinion and Congress. He is not foolish enough to believe that one man, even one invested with the powers of the Presidency, can alter the fundamentals of politics. Instead, “facilitators understand the opportunities for change in their environments and fashion strategies and tactics to exploit them.” Directors are more like revolutionaries. Facilitators are more like tacticians. Directors change the system. Facilitators work the system. Obama’s first three years as President are the story of his realization of the limits of his office, his frustration with those constraints, and, ultimately, his education in how to successfully operate within them."

The Obama Memos: How Washington Remade the President : The New Yorker