Jollyblogger has an excellent post on being Christian and being politically involved. It's an excellent trip through the various things the Bible says relevant to why it's good to be political involved and bad to identify some political party or nation with Christianity. This is about as balanced as you can get on this topic. I agree with all his main points. Unfortunately, I find myself disagreeing with him on quite a few of his minor and tangential points, and I can't resist picking nits by mentioning those (since I can't wholeheartedly recommend a post this glowingly if it has so many things I disagree with without also registering that disagreement).
I disagree with him on slavery. I don't think slavery is wrong in principle. (Incidentally, this is something Wink and I agree on, and we didn't have to convince each other. I credit him with bringing the issue to my attention, but all he had to do was mention what his view was without mentioning any of his reasons for thinking so, giving me just a few seconds to think about it in light of the Bible, and I realized he was right. Maybe one of us should post on this soon. Maybe I've just given Wink an idea and won't have to do it myself.) I also disagree with David's post a little on abortion. Some Christians think abortion is often wrong but occasionally not morally abhorrent, and those who are in the tough situation of having to make a choice about it should be given some moral deference by those who have never been in that situation. David thinks this person should fall under church discipline. I don't see how church discipline should even be an option, especially if the person has thought carefully about all the options and come to this conclusion through reflecting on biblical principles. It's the unthoughtful person that I would have thought more deserving of church discipline. Finally, I don't think it's as hard to get a biblical position on war as he thinks. After all, if God can command war, then it can't be inherently wrong to engage in war. I've talked about this before. Still, even with those tangential disagreements, it's an excellent post. Any Christian blogger who writes about politics should digest it after chewing on it thoroughly.
P.S. Check out his post on seeking balance in one's theological views as well. How does he have the time to keep cranking out so many excellent and in-depth posts every day?