Fox News is famous for its iconoclastic conservative take on US politics, while rival MSNBC is seen by some experts as becoming its liberal equivalent. But do cable news stations influence election campaigns?
For the best part of a decade Fox News has been the dominant US cable news network.
Its blend of jaunty news during the day, and colourful conservative pundits - like Sean Hannity, Bill O'Reilly and Glenn Beck - during the evening has proved a popular formula.
Beck has gained notoriety. His eponymous show on Fox News, where he can weave together targets as diverse as Woodrow Wilson, the Black Panthers and Goebbels in a heady hour-long polemic, is watched by 2.5 million people, despite being hours before primetime. It beats its rivals on the other cable news networks more than 4-1. Fox News is for Americans who have felt for years that the media are dominated by the East Coast liberal elites that make decisions that don't reflect the rest of America”
Fox News's dominance has caused concern for some on the other side of the political divide. ...
For all of Fox News's alleged partisanship, there are some analysts who feel MSNBC is going the same way - turning into a liberal version of Fox News.
"It's definitely there," says Prof Kerwin Swint, author of Dark Genius: The Influential Career of Legendary Political Operative and Fox News Founder, Roger Ailes.
"You can see their progression of following the lead of Fox News."