The analysis of interest group influence is crucial in order to explain policy outcomes and to assess the democratic legitimacy of the European Union. However, owing to methodological difficulties in operationalizing influence, only few have studied it. This article therefore proposes a new approach to the measurement of influence, drawing on quantitative text analysis. By comparing interest groups’ policy positions with the final policy output, one can draw conclusions about the winners and losers of the decision-making process. In order to examine the applicability of text analysis, a case study is presented comparing hand-coding, WORDSCORES and Wordfish. The results correlate highly and text analysis proves to be a powerful tool to measure interest groups’ policy positions, paving the way for the large-scale analysis of interest group influence.

Why are some interest groups able to lobby political decisions successfully whereas others are not? This article suggests that the issue context is an important source of variation because it can facilitate or hamper the ability of interest groups to lobby decision-makers successfully. In order to test the effect of issue characteristics, this article draws on a new, unprecedented data set of interest group lobbying in the European Union. Using quantitative text analysis to analyse Commission consultations, this article studies lobbying success across 2696 interest groups and 56 policy issues. The findings indicate that lobbying success indeed varies with the issue context, depending on the relative size of lobbying coalitions and the salience of policy issues, whereas individual group characteristics do not exhibit any systematic effect.

Do parties listen to their voters? This article addresses this important question by moving beyond position congruence to explore whether parties respond to voters’ issue priorities. It argues that political parties respond to voters in their election manifestos, but that their responsiveness varies across different party types: namely, that large parties are more responsive to voters’ policy priorities, while government parties listen less to voters’ issue demands. The study also posits that niche parties are not generally more responsive to voter demands, but that they are more responsive to the concerns of their supporters in their owned issue areas. To test these theoretical expectations, the study combines data from the Comparative Manifestos Project with data on voters’ policy priorities from the Comparative Study of Electoral Systems and various national election studies across eighteen European democracies in sixty-three elections from 1972–2011. Our findings have important implications for understanding political representation and democratic linkage.

Coalition parties have to reconcile two competing logics: They need to demonstrate unity to govern together, but also have to emphasize their own profile to succeed in elections. We argue that the electoral cycle explains whether unity or differentiation prevails. While differentiation dominates at the beginning and the end of the legislative term in close proximity to elections, compromise dominates the middle of the term when coalition governments focus on enacting a common policy agenda. To test our theoretical claims, we draw on an innovative quantitative text analysis of more than 21,000 press releases published by coalition parties from 2000 until 2010.

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