I see no evidence of a pro-Obama media bias.  The NY Times, the most influential newspaper in America endorsed Hillary. You have Paul Krugman slamming Obama every single week. You have CNN giving airtime to professional Clinton shills James Carville and Paul Begalis, and James Carville appearing on Meet the Press every week.  You had CNN declaring Hillary the winner of every debate all summer long even when their own focus groups declared Obama the winner. You had CNN annalists siding with Hillary over the whole debate about meeting with foreign leaders. You have Hillary appearing on Letterman the day before Super Tuesday and appearing on John Stewart the day before March 4th voting. You have Saturday Night Live aggressively promoting Hillary in the weeks leading up to March 4th voting.  Hillary is just so used to be treated like royalty that even the slightest lack of adulation is interpreted as bias.  In addition, Hillary knows that by whining about bias she'll get sympathy and scare the media into giving her even better treatment.

Barack Obama towers as the most far left progressive person running for president. And this isn't the spin of some enthusiastic supporter (in fact I've been leaning a bit towards Edwards since Michael Moore praised him), this is the objective assessment of the prestigious and authoritative National Journal which examined the totality of each candidates actual votes in three broad areas: Social issues, economic issues, and foreign policy issues.  When life time scores were compiled by the New York Times political blog, amazingly Obama towered over even ultra progressive Kucinich.

Senator Barack Obama......................84.3
Representative Dennis Kucinich........79.4
Senator Christopher J. Dodd .............79.2
Senator Hiliary Rodham Clinton ......78.8
Senator Joseph R. Biden, Jr...............76.8

Source:  http://www.majorityrules.org/blog/2007/0 3/senator-barack-obama-more-liberal-than .html