Wanted: book recommendations for my repub. dad

My father isn't your ordinary republican. Or perhaps he is depending on your definition. He's non religious, highly educated, hard working, and has a kind nature. He is not anti-choice nor is he homophobic or racist. He has an avid interest in alternative energy. Over the last fifteen years he's become an advocate of organic foods, positive thinking, and avoiding the pitfalls of pharmaceutical industry. He hasn't quite made the connection between his republican party and Big pharma. He is staunchly anti-drug, including prescription drugs.

Recently my dad agreed to exchange political books. As he put it, I'll read your propaganda if you read mine.

A number of books immediately come to mind. The key is engaging his interest in making it a continual adventure. Sending him Greg Palast's The Best Democracy Money Can Buy would illicit an exasperated sigh and the words whiney liberal. Al Franken's Lies and The Liars Who Tell Them light reading, humorous, but that chapter of Gore in Vietnam makes me cringe. I like Jim Hightower's Thieves In High Place, David Brock, or Thomas Frank's What's a Matter With Kansas and so on. The possibilities are endless.

What would you suggest? What single book was an ice breaker?