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Okay, I found this interesting and actually rather fun reading. Note going in what it says near the end--these are GENERALITIES. We're all very complex and use all parts of our brain, and have our own iindividual mixtures of functioning. It does hopefully help illuminate where those nutsos on the "other" side might be coming from, though. :)
Discover Magazine: "It may seem like a stretch to say that one could predict whether you lean left or right by looking at a brain scan—no questions asked, no opinions voiced—purely based on your neuroanatomy. However, this might not be too far from reality—at least insofar as predicting thinking style, which has been shown to be somewhat distinct based on party association."