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Many liberal democracies have witnessed the rise of radical right parties and movements that threaten liberal values of tolerance and inclusion. Extremist movement factions may promote inflammatory ideas that engage broader publics, but party leaders face dilemmas of endorsing content from extremist origins. However, when that content is shared over larger intermediary networks of aligned supporters and media sites, it may become laundered or disconnected from its original sources so that parties can play it back as official communication. With a dynamic network analysis and various-time series analysis we tracked content flows from the German version of a global far-right anti-immigration campaign across different media platforms, including YouTube, Twitter, and collections of far-right and mainstream media sites. The analysis shows how content from the small extremist Identitarian Movement spread over expanding networks of low-level activists of the Alternative for Germany party and far-right alternative media sites. That network bridging enabled party leadership to launder the source of the content and roll out its own version of the campaign. As a result, national attention became directed to extremist ideas. [ABSTRACT FROM AUTHOR]