OPEN SOURCE POLITICS….Kevin Hayden has put together a new group blog, Open Source Politics, which makes its debut today with over a dozen articles on subjects ranging from CEO accountability and teachers’ unions to Valerie Plame and Roger and Me.

I can’t quite tell whether OSP is the ultimate in group blogs, with over 40 contributors, or if it’s really more a Slate-like e-magazine. In any case, there’s plenty of good stuff on Day 1, and here’s hoping they have a long and happy career as a progressive voice on the web.