Hey Joe, here's an interesting stat: About 38.5% of men and women (combined, the numbers are a little different for each) will be afflicted with cancer in their lifetimes.
Certainly some of that will have to do with lifestyle (smoking, obviously) but for the rest, they just GET it, no matter how intelligent they are, or how they live their lives.
I'd think that 38.5% figure is pretty close to the percentage who are afflicted with hardcore partisan ideology (both ends combined), causing their perceptions and thought processes to be damaged, just as cancer damages cells.
Anyway, I thought that was an interesting and appropriate stat.