Wikipedia
WatchBlog is a multi-writer weblog divided into three political columns, each with its own blog: Democrats & Liberals, Third Party & Independents, and Republicans & Conservatives.
WatchBlog, founded in 2003 by pioneering blogger Cameron Barrett, was one of the first to use the multiple blog front page format Public participation is welcome provided WatchBlog policies are observed. Several authors work to ensure that new articles are posted in each column nearly every day, ranging from current events from the view of the writer in the specified column to multi-part examinations on issues that span the entirety of the political atmosphere.
UPDATE: WatchBlog was acquired by the Matador Web Group in September, 2011.
A search feature allows for visitors to search through the archives of the individual blogs as well as list the chronology of the blogs. A listing for each writer's articles is also accessible with information about the writer themselves.
From the WatchBlog website: "Let's face it, politics is confusing. Sometimes it's difficult to know whom to believe, who to listen to and who to support. We're here to help. Posting on a regular basis are editors representing each major party. Stay informed."