The media are biased and in many instances are willing to print outright lies in order to advance their agenda. This is probably true of most the left and the right, but seems more prevalent on the left. This may be simply because 90% of the media is biased to the left. Here is an example of an outright lie:

French TV Shows Gazans Killed By Hamas, Blames Israel
January 6, 2009
Posted by John at 3:28 PM

Public television network France 2 has admitted that earlier today, it showed photos of dozens of bodies of members of Hamas and civilians who it said were killed in an Israeli bombing raid on January 1. Only problem: the photos were actually taken in 2005, and the people depicted were killed not by Israel, but when "a truck full of explosives blew up in the Jabaliya Refugee Camp." The terrorists, in other words, blew themselves up accidentally and took a number of civilians with them.