*PLUG* I interrupt this regularly scheduled campaign site with a minor plug for a course for which I think we can all benefit from: Argumentation: The Study of Effective Reasoning, 2nd Edition.
I got this series as a CD course for my wife and it really does come in handy. You will learn how to create a defense for an argument (a point of view) and understand how to effectively counter an opponents point. It will show you how to recognize fallacies and other manipulations of language that may trip up a person during a debate. And, yes, it even covers the Lincoln-Douglas debate.
Since we are all politically motivated and wish to get our point across, this is a book/course I highly recommend. The nice thing is, it is on sale from The Teaching Company. I should add that neither I, the author, nor the site maintainer will earn any money from this plug. I'm just putting it out there for your edification.