Your premise is that Google News only include news, which is totally wrong. Google News includes lots of comments. For example, Huffington post appears a lot in Google News.
EDIT: Oh, and I totally missed your remark about the Huffington Post. The reality is quite the contrary! Until the recent lay-offs post the Verizon acquisition, they had some of the best reportage on legislative activities in the House. Certainly, they have a liberal bent (which they do not hide), but the reporters they have (or had) are very good at their jobs.