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Do political parties respond to interest group mobilization? While party responsiveness to voters has received widespread attention, little is known about how interest groups affect parties' policy agendas. I argue that political parties respond to interest groups as lobbyists offer valuable information, campaign contributions, electoral support and personal rewards, but that party responsiveness is conditioned by voter preferences. Based on a novel longitudinal analysis studying the responsiveness of German parties to interest groups across eleven issue areas and seven elections from 1987 until 2009, it is shown that parties adjust their policy agendas in response to interest group mobilization and that interest groups are more successful in shaping party policy when their priorities coincide with those of the electorate. [ABSTRACT FROM AUTHOR]