Political Parties are vehicles for nominating government officials of a desired political persuasion. Part II focused on what is perhaps the most visible mechanism by which parties go about achieving this central function, the system of primary elections that is used to select standard-bearers for the party. Parties, however, do much more than simply conduct primaries in joint effort with the states. They seek to win general elections. Yes, they do so by attempting to nominate candidates who will be maximally competitive in those general elections. But to increase their chances of electoral victory, parties also mobilize voters to increase turnout, work to build and strengthen coalitions, conduct party conventions, run advertisements, and assist the campaigns of their candidates in a variety of other ways. All of these efforts generally have one thing in common: they cost money.