I recently finished the reading of the book of Arthur Schopenhauer the art of always being right. As the title suggest, the book aims to give you techniques in order to seem that you are always right, either in a conversation, a debate or a negociation. The goal is not to provide argumentation, but to leverage the art of dialectic, which the author considers as different.
Very interesting book, quick and easy to read, which gives you concrete examples on how to use those techniques. I believe the best way to use this book is to read it, then to watch couple of politic debates in order to see how those masters use the techniques.