5 ideas
The president's formal constitutional authority is too weak and too widely shared to secure compliance by command. Real power comes from persuading other holders of power that what he wants is what their own responsibilities and interests require. Persuasion is therefore bargaining among separated institutions sharing powers, not the issuing of orders.
The American system does not divide powers cleanly among branches. It creates distinct institutions that each hold a piece of the same powers, so Congress, agencies, the courts, parties, and states all have independent leverage over any outcome. Every actor the president needs has its own constituency and its own stake, so he has to treat them as partners in a trade, not as subordinates.
The people the president must persuade constantly judge his skill and his will to use his advantages, and they anticipate how he will react before they decide what to do. A reputation for following through and punishing defection makes future bargaining easier. Visible hesitation or reversal teaches insiders that he can be safely ignored. Every choice is a signal that builds or erodes this reputation, so it compounds over time.
Washington insiders read the president's standing with the public to estimate what it would cost them to oppose him. Prestige works indirectly: it changes how others weigh resisting him, rather than moving policy by itself. Neustadt argues that prestige is shaped less by speeches than by what happens to people's lives during his term, and that it tends to erode.
A president has to judge every decision by its effect on his future capacity to persuade, not only by its policy merits. Because no adviser or institution has an interest identical to his, he has to gather his own information, keep options open, and watch the details of who gets what. Eisenhower's reliance on staff hierarchy and delegation shows how a president who does not protect his own power stakes loses influence without noticing.