Hearing vs. Seeing

http://business.newsfactor.com/news/Obama-Bounce--Convention-or-Ads-/story.xhtml?story_id=032002ZH5ZWG

In this article it mainly talks about the reason for Obamas bounce. Martha (person who wrote the article) thinks it wasd mainly because of the ads. Obama air more than double the ads romney air. What does this tell about the power of speech vs. the power of media? I dont think this article has bias. Citizens can find the information they need everywhere, they just to make sure that that they dont limited themselve to one or two sources only. Bias always play a role.