As President Obama and Mitt Romney prepare to square off in Denver, Colorado tonight, we look at how the Democrats and Republicans manage to shut out all third parties from the presidential debates. The Obama and Romney campaigns have secretly negotiated a detailed contract that dictates many of the terms of the 2012 presidential debates. This includes who gets to participate, as well as the topics raised during the debates. We’re joined by George Farah, founder and executive director of Open Debates, and author of the book, "No Debate: How the Republican and Democratic Parties Secretly Control the Presidential Debates."