Alex Tabarrok links to a debunking of the rather lame “smart states voted for Gore” hypothesis—on the basis that there’s no state-level IQ data for anyone to reach such a conclusion.
However, there is individual-level data in the 2000 American National Election Study, conducted by the University of Michigan, and this data supports an opposite conclusion: the mean level of both intelligence and political information-holding for Gore voters was lower than for Bush voters. Not much lower, mind you, but the difference is statistically significant.