Machiavelli's analysis was both positive and prescriptive: how ought the prince maintain and extend his power? Public Choice has sometimes been accused of being a handbook for would-be despots.
Now, Bueno de Mesquita (HT: @Isegoria) has produced a book that leans more closely to this kind of users-guide: The Dictator's Handbook: Why Bad Behaviour is Almost Always Good Politics. This one's going to the top of my Amazon queue. In the meantime, here's Moynihan's review.
There would probably be a market for an intelligent-layman treatment of all the public choice results on voting and elections written as a guide for candidates and junior politicians.