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Changes in political perceptions and preferences may result from the combined effects of news from various media. Estimating these combined effects requires the best possible, albeit different, measures of news obtained from self-selected mass media and social media that can be linked to panel survey data concerning perceptions and preferences. For the 2017 Dutch national elections, such data is available. Political perceptions and preferences are affected by news statements in self-selected mass media on issue positions, support and criticism, real world conditions and success and failure, in accordance with the theories on agenda setting and issue ownership, social identity, retrospective voting and bandwagon effects, respectively. Combined effects emerge because many people use both mass media and social media. The latter do more than just reinforce predispositions. Social media also have a mere exposure effect, and a multistep flow effect that amplifies news about party successes and failures from self-selected mass media. [ABSTRACT FROM AUTHOR]