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Wikipedia's Bias Against Conservative Leaders Exposed in New Report

 June 22, 2024

A study from the Manhattan Institute reveals evidence of political bias in Wikipedia articles, with right-wing figures portrayed more negatively compared to left-wing figures.

This bias in favor of figures such as Barack Obama and against politicians such as Donald Trump has broader implications as Wikipedia content is often utilized by AI systems, potentially influencing widely accessed information, as the Daily Mail reports.

The Manhattan Institute, a conservative think tank, conducted this study to analyze political biases in Wikipedia entries. The researcher responsible, David Rozado, examined mentions of 1,628 political leaders, lawmakers, and judges from the US and other Western countries. The study analyzed a vast dataset, including 3.8 million paragraphs on Wikipedia where these figures were mentioned.

Rozado's findings indicated a discernible pattern: conservative leaders, such as Trump, were frequently framed negatively, whereas left-wing leaders, including Obama, received more favorable portrayals. Rozado highlighted this trend as common but not universal, emphasizing that Wikipedia's goal of maintaining a neutral point of view was not being met.

Evidence of Political Bias in Wikipedia

The study provided specific examples of political bias, highlighting the disparity in how different political orientations are represented. Rozado pointed out that American right-of-center public figures were often associated with more negative sentiment compared to their left-of-center counterparts.

In addition to American politicians, the bias extended to judges, journalists, media organizations, and other Western leaders. In contrast, British politicians and US think tanks were presented more impartially, suggesting a selective bias in Wikipedia's content.

This perceived bias in Wikipedia has significant implications. With Wikipedia content often serving as a resource for AI chatbot training, such as OpenAI's ChatGPT, any bias in the original content can potentially influence the AI systems that rely on it.

Warnings From Wikipedia's Co-Founder

Larry Sanger, co-founder of Wikipedia, raised concerns about bias in 2021. He claimed that Wikipedia had turned into propaganda for the left-leaning establishment, with conservative viewpoints being suppressed. Sanger maintained that while negative content about figures like Joe Biden was removed, opposing conservative voices were excluded.

Historically, allegations of bias are not new to Wikipedia. A 2012 study found that terminology favorable to Democrats was more prevalent than Republican-friendly language. Critics have argued that the demographic makeup of Wikipedia's editing community, predominantly straight, white males from Western countries, significantly influences the site’s content.

Broader Implications for AI Systems

The significance of Wikipedia's bias extends beyond just the articles. With the platform playing a crucial role in AI training datasets, any inherent bias in Wikipedia could be perpetuated in AI systems used by millions of people. Rozado expressed concerns about this potential for bias infiltrating widely used AI technologies, impacting how information is accessed and perceived globally.

Wikipedia, the largest online encyclopedia, drew over 84 billion views last year, with significant traffic from the US, Britain, India, Canada, and Australia. This wide reach underscores the potential impact of biased information on a global scale.

The Need for Neutral Content

Rozado's study also called attention to Wikipedia's failure to adhere to its own neutrality policies. The NPOV (Neutral Point of View) policy, intended to ensure unbiased content, appears ineffective given the findings. Rozado stresses the necessity for truly neutral content creation, especially on platforms relied upon by vast audiences and AI systems.

The repercussions of this bias are particularly concerning in the context of America's polarized political climate. Accurate and unbiased information is crucial for a well-informed public, making the need for reform in Wikipedia's content creation and editorial processes more pressing.

Addressing the Bias

Addressing the biases identified in Rozado's study will require significant effort. It may involve diversifying the demographic composition of the editing community, reforming editorial guidelines, and increasing transparency in the content creation process.

Despite the challenges, it's imperative for platforms like Wikipedia to strive for impartiality. As a widely referenced source, it holds a responsibility to present balanced viewpoints, particularly on politically charged topics.


The Manhattan Institute's study revealing political bias in Wikipedia has serious implications for information access and broader societal perceptions.

With significant evidence suggesting that conservative figures are portrayed more negatively than their liberal counterparts, the study underscores the importance of neutral content in widely used resources.

Additionally, the influence of Wikipedia's content on AI systems highlights the need for addressing biases to maintain the integrity of information consumed by the global public. As Wikipedia continues to evolve, ensuring impartiality in its content is essential for its credibility and the trust of its users worldwide.