http://www.amazon.com/Prophetic-Imagination-Walter-Brueggemann/dp/0800632877/sr=1-1/qid=1170997039/ref=pd_bbs_sr_1/104-0155016-9446311?ie=UTF8&s=booksIt was written first in the 70s, but it's so relevant today it's fucking awesome - it's like he's describing the apostasy of Shrubbie and his administration. The book is about the prophets of old (Jeremiah, Isaiah, John the Baptist, etc.), and how the Church has lost that voice and needs to reclaim it.
But Brueggeman is clever - he never, ever says anything about liberals, conservatives, republicans, democrats, etc. He just lays out a perfectly scriptural idea of society and the role of Christians in it, to be prophets, critiquers, etc., and not patriots (though he doesn't use that word, either), and let's the scripture speak for itself for the most part.
He does it all so gently in terms of never naming specific people or groups of people, but he is definitely from what we might call a "liberal" political and theological stance (which isn't really liberal, it's just authentically biblical).
Your rightwingers would have an absolutely awful time refuting him.
And if you don't know who Brueggeman is, he is one of the world's greatest living Old Testament scholars. He's a United Church of Christ member, and a professor at a seminary that I've had too much gin to remember (but it's not a UCC seminary - Methodist, maybe?). Rock solid scholarship, laid out clearly and succinctly, with footnotes and scriptural references and a world of knowledge and experience behind him.
It would totally kill your rightwingers!