This article introduces the first findings of the Political Party Database (PPDB) project, a major survey of party organizations in parliamentary and semi-presidential democracies. The project's first round of data covers 122 parties in 19 countries. In this paper we describe the scope of the database, then investigate what it tells us about contemporary party organization in these countries, focussing on parties' resources, structures and internal decision-making. We examine party-family and within country organizational patterns, and where possible we make temporal comparisons with older datasets. Our analyses suggest a remarkable coexistence of uniformity and diversity. In terms of the major organizational resources on which parties can draw, such as members, staff and finance, the new evidence largely confirms the continuation of trends identified in previous research: i.e., declining membership, but enhanced financial resources and 2 more paid staff. We also find remarkable uniformity regarding the core architecture of party organizations. At the same time, however, we find substantial variation between countries and party families in terms of their internal processes, with particular regard to how internally democratic they are, and in the forms that this democratization takes.3

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In recent decades, parties in many parliamentary democracies have radically reshaped what it means to be a party member, making it easier and cheaper to join, and giving members greater direct say over party decisions. This article explores some implications of such changes, asking whether membership costs and benefits influence which supporters take the step of joining their party. In particular, it considers the impact of net membership benefits on membership demographics and on members’ ideology. The investigation examines patterns of party membership in 10 parliamentary democracies, using opinion data from the European Social Survey and data on party rules from the Political Party Database project. Our analysis shows that party supporters are more sensitive to political benefits than to financial costs, especially in terms of the ideological incongruence of who joins. As a result, parties offering higher benefits to their members have lower ideological and demographic disparities between members and other party supporters. This is a positive finding for party-based representation, in that it suggests that trends toward more inclusive decision-making processes have the potential to produce parties with memberships that are more substantively and more descriptively representative of their supporters.

The minimal effect theory of campaign studies stipulates that intense political competition during campaigns assures and reinforces the initial party choice of the electorate. We find that this reinforcement is two-fold. During the campaign, the party preference of the voters’ in-group party increases while the party preference of the voters’ out-group parties decreases. Voters’ preference for their most preferred party (MPP) increases during the election campaign, while their preference for their least liked party decreases during the campaign (LPP). Across parties voters experience an increase in their preference for their most preferred party and a decrease for their least liked party as the campaign progresses. These trends show that the political campaign polarizes the electorate by increasing the affective distance between in-group party and out-group party preferences, thereby resulting in stronger political polarization after the campaign than before the campaign. The data utilized in this study is a large six-wave panel-study of Danish voters’ party preferences during the Danish parliamentary election of 2011. Thus, the analysis provides evidence of the minimal effect theory and of political polarization within a multi-party context.

This chapter investigates whether variations in party affiliation rules have political consequences, looking in particular at their effects on partisan participation. The research presented here combines data from the Political Party Database (PPDB) with surveys of party members and party supporters, looking for evidence of whether potential affiliates’ behaviour is sensitive to the relative costs of party membership. The data suggest that such sensitivity exists, with supporters being more likely to join parties which offer more benefits, and which offer membership at a lower price. They are also less likely to acquire traditional membership if cheaper affiliation options exist. Conversely, when membership is relatively costly, those who do join are more likely to use their membership by being active in the party. Our findings provide some support for demand-side views of party membership, according to which political parties are able to use membership rules to affect who joins a party.

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