I just listened to a model discussion about this. It’s helpful on many levels.
The discussion took place on August 1, 2010, at a Sunday evening gathering at our previous church, CrossWay Community Church in Kenosha, Wisconsin. CrossWay has also summarized it in a 10-page PDF.
It’s finally available (along with a nice giveaway).
One short (144 pages)
Carl R. Trueman. Republocrat: Confessions of a Liberal Conservative. Phillipsburg, NJ: P&R Publishing, 2010. 
(Sample pages, video interview, and endorsements here.)
One long (624 pages)
Wayne Grudem. Politics according to the Bible: A Comprehensive Resource for Understanding Modern Political Issues in Light of Scripture. Grand Rapids: Zondervan, 2010.
1. The July 2010 issue of Themelios came out today. It’s loaded (as usual).
2. It includes my review of the 87-volume Zondervan Reference Bundle.
Details at James Grant’s blog.
A good, convicting word from Dane Ortlund.
Here is what I contributed to Justin Taylor’s blog last week:
Previous contributions:
