Abstract: The recruitment of political candidates is a basic function of political parties: a party that cannot attract and then nominate candidates surrenders its elemental opportunity for power. Two stages may conveniently be distinguished in the process of recruitment. Certification includes the social screening and political channeling that results in eligibility for candidacy, while selection includes the actual choice of candidates to represent parties in the general election. Selection is at the focus of the contest for power within parties, and is my focus here. Considering its importance we know too little about the dynamics of the nominating process. Most of what we do know derives from the analysis of two modal institutional types of political selection: the convention system and the primary system. Experience indicates that despite their manifest purposes, these contrasting institutional types have not necessarily resulted in widely different internal party structures. A variety of party patterns in one-party states—from the tightly controlled machines in Virginia to the transient and multiple factionalism of Florida—flourish in the framework of the direct primary system. Patterns of diffusing factionalism on the one hand, and of disciplined party organizations on the other are also found in states without primaries. Perhaps a closer look at the active participants in the processes of selection, and their interrelationships, may shed some further light on significant factorsin party structure. By interviewing candidates in party primaries we hoped to disclose the steps in nomination and the precise political relationships involved.