The Guardian media bias rating is Lean Left.

The Guardian is believed to have a lean left bias, in accordance with a features editor's assertion in 2004 that "it is no secret we are a centre-left newspaper." The Guardian was founded in 1821 to promote liberal interests during a turbulent time characterized by massive worker movements and growing anti-Corn Laws campaigns. It maintained its role as the voice of the left despite facing several financial hurdles over the years. By the 1970s and 1980s, a period of polarized politics in Great Britain, The Guardian’s opinion pages helped spawn the center-left SDP party. Meanwhile, its letters page was where the battle for the future direction of the Labour Party played out. When the Independent was launched in 1986, it solidified its position as a centrist British newspaper alongside The Guardian on the left and the Times and Telegraph on the right. A large majority of current readers vote for either the Labour or Liberal Democratic Parties, while the paper has traditionally endorsed one of those two parties during general elections. An AllSides Bias Rating™ of lean left seems to make sense given this information, and our community concurs, with a majority of more than 400 members agreeing with our rating for The Guardian.

More on The Guardian

The Guardian is a British national daily newspaper founded in reaction to the closure of a radical workers’ newspaper in 1821. The paper publishes content on its UK online edition, as well as its two international web sites, Guardian Australia and Guardian US. The newspaper’s print edition has an average daily circulation of 189,000 copies, behind the Daily Telegraph and The Times, and ahead of The Independent. Its online edition was the fifth most widely read in the world as of October 2014, with over 42.6 million readers.

Sources: Wikipedia: The Guardian

History of The Guardian

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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
1
Community Feedback
0
Editorial Review
1
Secondary Research

Confidence Level:

Medium

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.