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Open AccessJournal ArticleDOI

Bias in Cable News: Persuasion and Polarization

Gregory J. Martin, +1 more
- 01 Sep 2017 - 
- Vol. 107, Iss: 9, pp 2565-2599
TLDR
This article measured the persuasive effects of slanted news and tastes for like-minded news, exploiting cable channel positions as exogenous shifters of cable news viewership, and estimated that Fox News increases Republican vote shares by 0.3 points among viewers induced into watching 2.5 additional minutes per week by variation in position.
Abstract
We measure the persuasive effects of slanted news and tastes for like-minded news, exploiting cable channel positions as exogenous shifters of cable news viewership. Channel positions do not correlate with demographics that predict viewership and voting, nor with local satellite viewership. We estimate that Fox News increases Republican vote shares by 0.3 points among viewers induced into watching 2.5 additional minutes per week by variation in position. We then estimate a model of voters who select into watching slanted news, and whose ideologies evolve as a result. We use the model to assess the growth over time of Fox News influence, to quantitatively assess media-driven polarization, and to simulate alternative ideological slanting of news channels.

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References
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Affect, Not Ideology A Social Identity Perspective on Polarization

TL;DR: The authors argue that exposure to messages attacking the out-group reinforces partisans' biased views of their opponents, and that partisan affect is inconsistently (and perhaps artifactually) founded in policy attitudes.
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The Fox News Effect: Media Bias and Voting

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On the measurement of polarization

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What is the political bias of fox news?

The paper suggests that Fox News has a persuasive effect on increasing Republican vote shares.