A couple months back, Google quietly dropped the feature to comment on Google News. Yes, Google allowed those cited or mentioned in articles to comment on the stories, here is a look at how that worked.
For the first time, I have seen a thread in Google News Help forum asking why Google removed it. Inbal from Google responded with the official PR statement from Google:
Google has long believed that experimentation and iteration is the best way to build our products, and we're always experimenting with ways to make Google News more useful. Occasionally, this means we have to re-evaluate our efforts to be sure we focus on features that make the most sense for our users. We have phased out support for an experimental mechanism that allowed people quoted in news articles to offer comments on those stories. We are no longer soliciting comments, and comments that participants have provided naturally expired along with their clusters.
We're committed to continuing our efforts to help readers discover new perspectives on the news, while helping publishers find and reach new audiences online.
Honestly, I wasn't a big fan of this feature, simply because it just seemed out of the norm and hard for Google to maintain.
Forum discussion at Google News Help.