The news media are allowing themselves to be co-opted by the Democrats and Republicans into viewing campaigns solely through the prism of the two-party system. This means that the major parties control which issues are permitted into the debate, thus denying the public a chance to hear proposals that might seem extreme today but could gain traction in the future if only voters had an opportunity to consider them more seriously. Remember, third parties have been the catalyst for many reforms throughout American history, including the abolition of slavery, tough child-labor laws, free public education, strong business regulations, direct election of senators and women's suffrage.
By including more substantive coverage of third-party candidates, the press could help open the door to innovative alternatives to old issues. It might force the two major candidates to come off message more often and eventually adopt the new ideas pushed by otherwise marginalized candidates, much like the Republican Party did when it absorbed some of Ross Perot's proposals after the 1992 election.