New study shows that Fox News has greatly influenced the outcome of presidential elections

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A new study in the American Economic Review (the discipline’s flagship journal), with an intriguing and persuasive methodology, finds exactly that. Emory University political scientist Gregory Martin and Stanford economist Ali Yurukoglu estimate that watching Fox News directly causes a substantial rightward shift in viewers’ attitudes, which translates into a significantly greater willingness to vote for Republican candidates.

They estimate that if Fox News hadn't existed, the Republican presidential candidate’s share of the two-party vote would have been 3.59 points lower in 2004 and 6.34 points lower in 2008.

For context, that would've made John Kerry the 2004 popular vote winner, and turned Barack Obama's 2008 victory into a landslide where he got 60 percent of the two-party vote.

"There is a non-trivial amount of uncertainty" about those estimates, Yurukoglu cautions. "I personally don't think it's totally implausible, but it is higher than I would have guessed prior to the research." And even if the effect were half as large as estimated, that’d still mean that Fox News is having a very real, sizable effect on elections.

“Fox is substantially better at influencing Democrats than MSNBC is at influencing Republicans," the authors find. While most Fox viewers are Republican, a sizable minority aren't, and they're particularly suggestible to the channel's influence. In 2000, they estimate that 58 percent of Fox viewers who were initially Democrats changed to supporting the Republican candidate by the end of the election cycle; in 2004, the persuasion rate was 27 percent, and 28 percent in 2008. MSNBC, by contrast, only persuaded 8 percent of initial Republicans to vote Democratic in the 2008 cycle.

These are big effects, with major societal implications. The authors find that the Fox News effect translates into a 0.46 percentage point boost to the GOP vote share in the 2000 presidential race, a 3.59-point boost in 2004, and a 6.34-point boost in 2008; the boost increases as the channel's viewership grew. This effect alone is large enough, they argue, to explain all the polarization in the US public's political views from 2000 to 2008.

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