Because they measure the same thing: what people believe. There's nothing magic about peer review, you know.
No it didn't. But go ahead and prove me wrong. Tell me how they made sure that their questions covered a representative sample of beliefs.
Two misrepresentations and another straw man, Zig.
Misrepresentation 1) You know darn well what the difference is between research published in a peer reviewed journal and a partisan designed opinion poll. So don't bother going there, you know we know better.
The straw man) As for the study criteria you decided was needed: "made sure that their questions covered a representative sample of beliefs", that contains a misrepresentation and a straw man.
You are distorting what one of the studies looked at. You're saying you don't like the outcome measured to look at the effect of
certain misinformation in the news because the study didn't look at different misinformation. But that is not what the research was about so you are arguing a straw man.
In the one peer reviewed study they looked specifically at misinformation in the news regarding the Iraq War. It wasn't about the left vs the right. If you recall, the majority of Democratic legislators were equally on board with the Iraq war. Only a minority of us were against the war from the beginning. What the study was concerned with specifically were the lies amplified in the media that influenced public support for the war. If you've seen the video,
"Buying the War" by Bill Moyers, you'd know that the media's role disseminating misinformation about Iraq contributed to public support for the war when had the truth been known, the support likely would not have been there.
The researchers were looking at that issue specifically, not just at right and left wing media.
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Misrepresentation 2) Regarding your argument, however, I do think you could (but don't) have a point about right wing news consumer's being duped while left leaning news consumers were not being equally examined. The right would like to believe tu quoque in this matter. They've tried to match the criticism that sources like Media Matters are able to document. But the tu quoque has been a failure.
FAIR, for example, has never met the same standard of documenting their accusations against the "liberal media bias" as Media Matters has. But that's a discussion for a different day.
None of the left leaning mainstream media outlets puts out as much blatant propaganda as Fox News does. And that's what these studies show. So you would have a point if the studies only looked at one sided politics. Turns out, however, they didn't. And I showed you that with the
University of Maryland study and the
FairleighDickenson University studies.
In the former study, they looked thoroughly at both Democratic and Republican voters as well as looking at numerous political issues. You tried to dismiss this study based on what you believe were their assumptions about what was fact. You didn't bother to look at the actual study, you just dismissed it based on your confirmation bias.
The researchers used expert consensus views as their measure of truth. The researchers cite their sources. If you want to support your argument the study had a political bias in what was considered a fact, then you need to specifically show that is the case, not just wave your hand. The survey questions asked, "what do most [fill in the appropriate experts] say about [subject]. The researchers suggest this information is useful to a public charged with making democratic decisions.
The researchers did not ask whether the expert opinions were believed or not. The easiest one to use as a demonstration is the question about climate change. Whether you believe the scientific consensus or not, the consensus is an evidence based fact. A minority of dissenters among the scientific community does not change the fact there is a consensus among the majority. Fox News has a political motivation to broadcast lies about the scientific consensus. (Actually, they've begun to change that news narrative given the accumulation of irrefutable evidence that the climate is changing, but again that's getting off topic).
In the latter study they examined knowledge of worldwide events, not right or left wing opinions.
Among other topics, New Jerseyans were asked about the outcome of the uprisings in North Africa and the Middle East this past year. While 53% of New Jerseyans know that Egyptians were successful in overthrowing the government of Hosni Mubarak, 21% say that the uprisings were unsuccessful, and 26% admit they don’t know. Also, 48% know that the Syrian uprising has thus far been unsuccessful, while 36% say they don’t know, and 16% say the Syrians have already toppled their government.
These are not left and right wing political opinions.
But the real finding is that the results depend on what media sources people turn to for their news. For example, people who watch Fox News, the most popular of the 24-hour cable news networks, are 18-points less likely to know that Egyptians overthrew their government than those who watch no news at all (after controlling for other news sources, partisanship, education and other demographic factors). Fox News watchers are also 6-points less likely to know that Syrians have not yet overthrown their government than those who watch no news.
And the researchers controlled for the partisanship you claim they did not.
"Because of the controls for partisanship, we know these results are not just driven by Republicans or other groups being more likely to watch Fox News," said Dan Cassino, a professor of political science at Fairleigh Dickinson and an analyst for the PublicMind Poll. "Rather, the results show us that there is something about watching Fox News that leads people to do worse on these questions than those who don’t watch any news at all."
In addition, the following adds to the consistency of the results:
By contrast, some media sources have a positive effect on political knowledge. For example, people who report reading a national newspaper like The New York Times or USA Today are 12-points more likely to know that Egyptians have overthrown their government than those who have not looked at any news source. And those who listen to the non-profit NPR radio network are 11-points more likely to know the outcome of the revolt against Syrian President Bashar Al-Assad. However, the best informed respondents are those that watched Sunday morning news programs: leading to a 16-point increase in the likelihood of knowing what happened in Egypt and an 8-point increase in the likelihood of knowing what happened in Syria.
So your argument would be valid except it is misinformed. The studies looked at facts and knowledge, not one sided political opinions.