Same reason this does?
If they were covering the newest ads by each campaign or the messages of each campaign as reflected by their latest ads, they did the right thing.

That would apply to the campaign commercials they pick but not to the way hosts ask questions and the way they follow up… or not.
Apparently it does apply to that, and more than that, to who does or does not get on the show in the first place, and what stories/topics are or not covered at all. And the bias there is real, but it ain’t liberal.
But there’s something…you’re not considering…BrainGlutton…
Kudos to What for bringing all this pervasive RW-for-all-practical-purposes media bias to our attention! It is a real problem and needs to be addressed!

From where I sit, it’s not a Great Debate and it’s not an IMHO topic. It doesn’t fit perfectly into this forum either, but it may as well stay here as far as I’m concerned. It does relate to “political news, and politicians and public figures.”
Meh. Point taken, although I’m not particularly invested in the question of where it “belongs.” As far as I’m concerned, it mostly relates to the entertainment industry.

Who are the hosts for each?
Meet the Press is hosted by David Gregory, Face the Nation is hosted by Bob Schieffer, This Week is hosted by George Stephonopolis, Fox News Sunday is hosted by Chris Wallace, State of the Union with Candy Crowley is hosted by Candy Crowley, GPS with Fareed Zakaria is hosted by Fareed Zakaria, Reliable Sources with Howard Kurtz is hosted by Howard Kurtz, and the Chris Matthews Show is hosted by Chris Matthews.

Thanks…anybody see a pattern there?

Yes. Except for Crowley and Zakaria, they’re all older white guys.

I don’t think anyone does, but you seem to. Do tell.

Stare at it long enough and you will see the sailboat!
Well, an awful lot of those shows have the host’s name right there in the title.
Is that it? Do I win something?

Well, an awful lot of those shows have the host’s name right there in the title.
Is that it? Do I win something?
Yes! You win a bag of names!
OK, OK. You win a generous tab of the Straight Dope’s Finest LSD. Wait 1 minute 45 seconds for download and lick the exact center of your monitor. Enjoy!
As his username should make clear, he is currently entombed in parental responsibility. It is cruel to offer an invitation to strange travel to a man under house arrest.

As his username should make clear, he is currently entombed in parental responsibility. It is cruel to offer an invitation to strange travel to a man under house arrest.
Shut up, I’m trying to entertain his kids! Please Think Of The Children!
How often does a union leader appear on Meet the Press et al? Rarely. A representative of big business? Aw heck, I mentioned two above.

The show picked the “commercials” as lead-ins to the segment… they weren’t run as commercials as such.
One was a feel good spot… the other was just a tad nasty although 100% true. Something a bully would run.
You know, if the Romney campaign did not want a commercial run that showed their candidate as a bully… then maybe they should not have MADE IT IN THE FIRST PLACE.
“Boo hoo. The nasty network ran an ad that WE MADE that shows our candidate in an unfavorable light.”
As Marley23 pointed out, in order to show that the TV show was trying to bias the viewers, you need to prove that these ads were specially chosen, and that the show was not simply covering the newest ads by each campaign or the messages of each campaign as reflected by their latest ads.
If Romney’s campaign messaging is overwhelmingly negative, you don’t get to cry “bias!” when the media shows a negative ad of his.
How often does a union leader appear on Meet the Press et al?
Why would the Green Party warrant inclusion?
Remember, the political spectrum in the US ranges from the right to the far right. It’s only bias if they have more representatives from the right than the far right on a show at any given time.
Edit: The left is simply irrelevant, so it’s not bias to not include their opinions. Keeping the far right out of the public view by restricting them to their own television channels or misrepresenting their opinions is evidence of systemic collusion and probably conspiracy though.

Remember, the political spectrum in the US ranges from the right to the far right.
Not really, but it is in the interest of the right to perpetuate that illusion.
Watching Fox News makes you stupider. (Actual study.)