How does media framing of issues affect social movement mobilization? This relationship is examined in light of the striking variation in levels of German peace protest against INF missiles, the Gulf War and the NATO peace-keeping mission to Bosnia. I argue that this variation in mobilization capacity can be explained in part by the degree of congruence between media framing and movement framing of the issues involved. Congruence between the two framings facilitates movement mobilization, whereas divergence hinders it. I compare the relative congruence between movement framing and media framing in Die Tageszeitung and Der Spiegel coverage of the three issues. I also evaluate possible alternative or complementary explanations, including public opinion, 'normalization' and elite cues, and political opportunity structure.