Summary and Keywords
Four potential mechanisms explore the linkages between partian media outlets and attitudinal polarization, as well as discusses how such outlets cause polarization and influence American politics more generally: partisan media outlets can have direct effects on their audience, indirect effects on the broader population, effects on the news media, and effects on political elites. Some challenges and questions remain to be answered in each area in the hopes of spurring more, and broader, work on these media institutions.
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