Check out this documentary by UMass Boston professor Tom Ferguson titled, "Golden Rule: The Investment Theory of Politics"
The documentary provides a wealth of historical and contemporary arguments, made by Adam Smith, James Madison, Noam Chomsky, and others, for how economic interests influence state policies. I highly recommend it. For example, I learned that in today's newspapers, 35% of content is news and 65% is advertisements. I also learned that the greatest support for FDR's labor policies came from capital-intensive industries.
(Hat tip to Ian Seda at http://losexpatriadosenglish.blogspot.com/)