One of the oldest blogs and most political blogs I read is Dean’s World. Their tag line is “Defending the liberal tradition in history, science, and philosophy.” Lots of authors for posts so lots of different viewpoints are shown. They cover topics ranging from politics (mostly) to humor to Battlestar Galactica (and have an open comment post once a weekend where you can talk about anything).
I’m not very political so many times I don’t know what they’re talking about but that doesn’t stop me from coming back. But if you haven’t seen it, it’s worth checking out.
When I say “oldest blog” I mean they are one of the blogs I’ve been reading for the longest time. I’m not sure how I first found them – from a national story or something more local (Dean is in South-East Michigan). Check out some of the many times I’ve mentioned Dean’s World in my blog.
Unfortunately, you do have to register to comment, but they do make it pretty painless and it does count out a lot of the junk.
So you can be in your own mini episode of Battlestar Galactica! Here’s a 
