In this Media Matters article, Jamison Foser explains that:

"The defining issue of our time is not the Iraq war. It is not the "global war on terror." It is not our inability (or unwillingness) to ensure that all Americans have access to affordable health care. Nor is it immigration, outsourcing, or growing income inequity. It is not education, it is not global warming, and it is not Social Security.

The defining issue of our time is the media.

The dominant political force of our time is not Karl Rove or the Christian Right or Bill Clinton. It is not the ruthlessness or the tactical and strategic superiority of the Republicans, and it is not your favorite theory about what is wrong with the Democrats.

The dominant political force of our time is the media.

Time after time, the news media have covered progressives and conservatives in wildly different ways -- and, time after time, they do so to the benefit of conservatives."