Politics has never been kind to logic. And political campaigns, especially American Presidential campaigns, have always been absolute anathema to logical analysis and coherent rhetoric. Most people have built-in defense mechanisms to protect themselves from the really obvious fallacies, but the prevalence and persistence of email spam is a clear indication that the general defense against fallacious presentation is faulty at best, and hopeless at worst.
A good starting place to sharpen your logical analysis skills is the “Introductory Logic” summary at http://members.tripod.com/AttitudeAdjustment/Books/Logic.htm
This concise, punchy instant tutorial on logic is my favorite reference weapon when dealing with political spin doctors, religious zealots, and chiropractic mumbo-jumbo. Check it out, and join us smug, self-righteous few who delight in highlighting the logical fallacies of those who “think” with their guts instead of their brains.