Here is the profile in the New Republic.
Klein first started blogging, and he has franchised himself to keep pace. His WONKBLOG, which started out as a solo venture and has since swollen to include a staff of five, has arguably become the Post’s most successful project, bringing in over four million page views every month. “It’s ‘fuck you traffic,’” one of Klein’s Post colleagues told me. “He’s always had enough traffic to end any argument with the senior editors.”