The Question was "In what state did the reporter's privilege law applies to a blogger ( in the case Obsidian Finance Group, LLC v. Cox)?" There answer was OREGON
However, ponder this deeply folks. You are a blogger, in say Montana. You publish a blog post while living in Colorado. A corporation that is incorporated in the State of Washington and Oregon, sues you and they claim Oregon Law as jurisdiction over you.
You are a blogger whose reach is the entire world. Obsidian v. Cox as a case precedence is used all over the world. Read a case out of New Zealand recently. So I would say that there needs to be a national and international shield law, retraction law and to bring laws regarding media, into the New Media Revolution.