Fairness and Accuracy in Reporting is a great site to gain clarity on bias in media. The site clearly leans left, but give the background to stories that are being slanted for political reasons. In this case the mainstream media is passing on the story of an Obama gaffe where he said to small businesses, “you didn’t build that.” The only problem is that’s not exactly what he said.
http://www.fair.org/index.php?page=4593