Political parties can select the policies they offer, but have different reputations for competence, unequal capacity to mobilize activists, and different resources to deliver pork and patronage. These are crucial non-policy resources shaping their electoral success. We show how these non-policy resources also shape parties’ ideological positions and which type of electoral offers they target to poorer or richer voters. Hence, non-policy politics shapes both electoral success and which voters get what. We describe how the book assesses voters’ non-policy preferences with detailed survey and administrative data from Argentina and Chile, including a novel methodology for measuring partisan networks, and how those preferences shapes parties policy and non-policy offers. The book organization is described.