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We investigate how dominant media networks can manipulate voters in young democracies. During the first presidential election after the democratic transition in Brazil, TV Globo, the largest and most-watched network in the country, unexpectedly manipulated the news coverage of the last debate 2 days before the decisive second round. In a video segment, Globo unfavorably depicted the left-wing candidate, Luiz Inácio Lula da Silva. Using the geographical distribution of broadcaster-specific TV signals and the timing of election events, we identify the effect of the manipulation net of the effect of the debate itself, showing that Globo’s misleading reporting caused Lula to lose millions of votes. Our results showcase how the media can reshape an election in a single stroke, especially where the media is concentrated and politically inexperienced voters have few other sources of information.