Media Matters media bias rating is Left.

Media Matters bias rating is Left. As of May 2017, a majority of AllSides users who voted on this bias rating agreed. Of those who disagree, the average rating falls on the cusp of a Lean Left and Center bias rating. There is not enough evidence to change the rating at this time. Furthermore, on Media Matter's website, they define themselves as a "progressive research and information center dedicated to comprehensively monitoring, analyzing, and correcting conservative misinformation in the U.S. media."

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Media Matters for America is a 501(c)(3), web-based, not-for-profit organization. Media Matters was founded in 2004 by journalist and activist David Brock to "systematically monitor a cross section of print, broadcast, cable, radio, and Internet media outlets for conservative misinformation...every day, in real time." They publish research and analytic reports as well as rapid-response items and try to keep not only activists, but also the general public aware of misinformation. Some people consider Media Matters to be the media watchdog counterpart to the more conservative Media Research Center. They are also known for having declared a "War on Fox" in 2010.

Sources:

Wikipedia

Media Matters for America

See how we rate the media bias of other news outlets and writers.

The AllSides Media Bias Rating reflects the average judgment of the American people.

The AllSides Media Bias RatingTM reflects the average judgment of the American people. We don't use a convoluted mathematical or artificial intelligence model, but instead have regular people representing the broad spectrum of Americans blindly rate the bias of articles. That produces a fair, verifiable bias rating.

This media bias rating was determined using the following levels of bias verification.

Basis of Rating:

Blind Survey
Third Party Data
0
Community Feedback
0
Editorial Review
0
Secondary Research

Confidence Level:

Not Available

Unless otherwise noted, this bias rating refers only to news articles on their web site, not from opinion pieces or what is broadcasted on TV or radio. The opinion writers from the same media source may have different bias ratings, so individual writers often are rated separately.