I had somebody at work try and tell me that smart people voted for Kerry.
So I whipped out the NJ vote map and asked if all the smart people in NJ lived in Newark and Camden. And if that was the case, why did two red counties have the highest incomes in the country?
Needless to say she hasn't confronted me on politics since.
According to the 2004 ecit poll, there is a (slight) non-linear relationship between education and voting tendency. Those with the least education and those with post-college education tended to vote for Kerry, while those with a high school to college education tended to vote for Bush.
VOTE BY EDUCATION
EDUCATION (% OF SAMPLE) BUSH KERRY NADER
No High School (4%) 49% 50% 0%
H.S. Graduate (22%) 52% 47% 0%
Some College (32%) 54% 46% 0%
College Graduate (26%) 52% 46% 1%
Postgrad Study (16%) 44% 55% 1%
Since income is highly correlated with vote tendency, it is reasonable to suppose that MDs, MBAs, and other professionals having postgrad educations tended to vote for Bush, while PhDs and MAs tended to vote for Kerry.
I don't think any conclusion is warranted regarding the level of education (or level of intelligence, which isn't the same thing) and voting tendency. I think its the type of knowledge. People who are into the the sciences and professions tend to be conservative, and people who are into the humanities tend to be liberal.