AlterNet.org is a website that I rarely visit. Usually it is a link to an article from someone else. That does not mean that it should be left out in the cold. And considering it's following I'd say that it gets pretty heated at times.
From the about page.
"STRATEGIC JOURNALISM AlterNet has developed a unique model of journalism to confront the failures of corporate media, as well as the vitriol and disinformation of right wing media, especially “hate talk” media. Not only do we keep our readers highly informed on a wide array of topics, from hundreds of experts and sources, but we also provide laser focus on the most compelling issues of the day. We offer our readers comprehensive information, a positive vision for the future, and concrete action steps towards change. AlterNet believes that media must have a higher purpose beyond the essential goal of keeping people informed. We insist on playing an active role in helping our community funnel its energy into change"
According to their stats page they have a large following and give a breakdown of their readers.
Whether you believe as they do or want to keep informed of what the opposition is thinking and doing alternet.org has plenty to read.