At key moments in history, political understanding and action are irrevocably transformed. What makes such moments of transformation possible? This article examines the emergence of African nationalism in South Africa, following the multivocal appeal to African nationhood made by proto-nationalist leaders and intellectuals. In doing so I examine how new political imagination can reconfigure the structure of political relations and create powerful new possibilities for political organizing and action. African proto-nationalist leaders were ‘intermediary intellectuals’ who used African nationhood to speak to three different political logics of their key audiences: a ‘progressive nationhood’ to their white colonial audience, a ‘unifying nationhood’ to their missionary-educated African audience, and a ‘traditional nationhood’ to their rural African audience. African nationhood thus had a multivocal appeal which allowed proto-nationalist leaders to bring otherwise divided audiences to support a common political project. By bridging these divided communities, proto-nationalist leaders were able to combine resources and strategies from once separated domains into novel forms of political power. Transformation in political understanding was thus a critical enabler of innovation in organization and action because it built a political project where new connections between African and colonial worlds were made politically ‘thinkable’. Speaking to the scholarship on political repertoires and the sociology of anti-colonial intellectuals, this study has broader implications for the role political ideas play in political transformation.