Opposition Policy Influence through Agenda‐setting: The Environment in D enmark, 1993–2009

This article addresses the opportunities that the opposition has to influence policy – a topic that has been neglected in existing party policy research. The idea that is developed is applied to a remarkable environmental policy development during the Danish right‐wing government in the 2000s. Contrary to its position when it took office in 2001, the right‐wing government turned green and adopted a series of green policy initiatives. It is argued in this article that vehement and persistent criticism from the left‐wing opposition provides an explanation for this turn. Taking media coverage, public opinion, carbon dioxide emissions and the government's approval ratings into account, the empirical estimation based on unique quarterly data shows that opposition criticism had a systematic impact on the government's pro‐environmental policy development. The implications for party policy research are important. If the aim is to understand how parties matter to policy, the opposition should be taken more seriously.