media bias is a myth. The only bias the media has is to their check books. If it sells to play a political AD on the NEWS and then ignore the actual story in lieu of generating more controversy, then that's the way they'll play it.
This morning they were looping a McCain web ad claiming Obama called Palin a pig in lipstick and talking about whether he really was, when every non-anchor coming on the show agreed that he wasn't, and it's a colloquialism that's been part of his narrative for 15 months.
The line? "You can't take a pig and dress it up in lipstick. It's still a pig."
Meanwhile they've been running with the ad claiming Obama's only piece of education legislature was a bill to teach sex to kindergartners and not bothering to point out what the legislation was: a mandated course on sexual abuse to teach them what's appropriate and inappropriate behavior so they don't get molested by their priests or uncles.
Obama was up, so they are playing the republican Narrative to keep the race alive and boost ratings. Being able to call media bias from one side or the other is just another way to make money. Olbermann and O'Reilly make shit loads of cash off of each fanbase's hatred for the other.