This is actually pretty old but interesting nonetheless.
When it gets to the point that your political leanings impair your ability to do basic math one has to ask if maybe politics really is full of shit. Ok, not really, but this should serve as a reminder to all to keep your biases in check.
Here's the paper for reference
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2319992
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I think that's why the people who could influence the country the most, our engineers and doctors, tend to stay in the shadows. They are far more intelligent than the politician, yet they are too smart to put up with idiots all day.