Reforms could be made to increase media literacy and encourage greater media diversity. This could include measures to support alternative and independent media outlets, increase media ownership transparency, and provide greater funding for public interest journalism. Additionally, steps could be taken to promote media literacy and encourage the public to be more critical of the media, such as through education programs and media watchdog organizations.

In the end, it is important to acknowledge the role that the media plays in shaping political discourse and to work towards a media landscape that is diverse, transparent, and accountable to the public. By promoting greater media literacy and diversity, we can ensure that the public is better informed and that the political discourse is shaped by a wider range of voices and perspectives.

To learn in great detail about the political effect of mainstream media on US politics and society as whole including how the media industy is becoming ever-more increasingly monopolistic, you could start by researching academic literature on the topic. Some relevant fields of study might include political science, media studies, and economics. You could also look into think tanks and advocacy groups that focus on media reform and anti-trust policy.

There are also many books and publications that provide in-depth analysis on the impact of mainstream media on elections, US policy, and society in general. Here are some examples:

• "Manufacturing Consent: The Political Economy of the Mass Media" by Edward S. Herman and Noam Chomsky - This book is a classic in media studies and explores how the media acts as a propaganda system that serves the interests of powerful elites.

• "The Influencing Machine: Brooke Gladstone on the Media" by Brooke Gladstone - This graphic novel-style book provides an accessible overview of the history and impact of the media in the US.

• "Breaking the News: How the Media Undermine American Democracy" by James Fallows - This book explores the ways in which the media shapes political discourse and public opinion, and how this can undermine democratic institutions.

• "The Filter Bubble: What the Internet is Hiding from You" by Eli Pariser - This book explores how personalized algorithms used by tech companies can limit our exposure to diverse viewpoints and affect political outcomes.

• "Weapons of Math Destruction: How Big Data Increases Inequality and Threatens Democracy" by Cathy O'Neil - This book examines how algorithms and big data can perpetuate biases and exacerbate inequalities in society.

In addition to books, there are also many articles and reports published by think tanks and media watchdog organizations that provide in-depth analysis on the impact of mainstream media on US politics and society. Some examples include the Center for Media and Democracy, Media Matters for America, and the Columbia Journalism Review.

In addinton to the mentioned resrouces, here are some organizations that focus on media reform and anti-trust policy include:

• Free Press - A nonpartisan organization that focuses on media policy advocacy and media reform.

• Media Matters for America - A progressive media watchdog organization that monitors and analyzes media coverage and advocates for media accountability.

• Open Markets Institute - A think tank that focuses on anti-monopoly policy and advocates for fair competition in the media industry.

• Common Cause - A nonpartisan advocacy organization that focuses on issues related to democracy and government accountability, including media reform.

• Public Citizen - A consumer advocacy organization that works on a wide range of issues, including media reform and anti-trust policy.

By joining or supporting these organizations, you can help limit the influence of monopolistic media in US politics. Additionally, staying informed about media issues and supporting independent media outlets can help promote a diverse and competitive media landscape.