Molly Ziegler, Leaving politics aside?, looks at the media coverage of borderline evangelical Greg Boyd's recent controversy over refusing to get his church involved in politics. (I say borderline because Boyd is an open theist, and many consider open theism automatically a disqualifier for evangelicalism, while others do not.) While I agree with the general sort of view of the church and politics that Boyd is saying, I agree with the criticism of his erroneous claim that Jesus didn't push people's buttons about sex. He most certainly did. Also, I think the abortion discussion toward the end reveals that there's a distinction between the church taking a stance on the best political policies and leaders (which I'd say is contrary to the church's purpose) and the church taking a stance on moral issues that are clear in scripture (which I think is its obligation).
I've just spent a good deal of time working through Augustine on this issue, and when I get a chance to put it into post form I'll be posting my notes. I really appreciate almost everything he has to say on it, but that will have to wait.