Presidential Election and IQ
The graph below plots the percentage vote (by state) received by each candidate in the 2008 presidential election as a function of the IQ of the voters in those states. For example, the average IQ in New Hampshire is 104 with 54% of New Hampshire voters casting their ballot for Obama (blue point) and 45% voting for McCain (red point). The graph shows the results for all 50 states.

The solid lines are fits to the data, and have an r-squared of 0.66 (a perfect fits gives an r-squared of 1.0).
The average IQ for each state is estimated from the the SAT and ACT college entrance exams, and the data is adjusted for the fraction of students who attend college in each state. Details can be found on the Social Quotient web site. The election results by state can be found on the CNN web site.
I am not commenting on the meaning of these results. Let the debates begin!
Comment from Van Sloan:
Mark, your graph appears to be accurate and similar to state IQ/ vote results in the 2004 election. Others commenting on that earlier result pointed out that the racial makeup of US states vary, likely causing much of the state IQ differences. One particularly thoughtful analysis came from a Chicago MBA student, shown at http://www.sq.4mg.com/RaceVoting.htm
My interpretation of state IQ/ vote results is that people tend to vote for their self interests. Voters with below average incomes and IQ's (including most minorities) typically favor Democrats who propose increased spending for social services, funded by additional taxes on the wealthy. Republican candidates generally opposes higher taxes.
In the early 1960s, Bill Buckley famously observed that he would rather be governed by the first two thousand names in the Boston phone book than the two thousand faculty members of Harvard University. I agree. High IQ is associated with higher incomes, but it does not necessarily mean smart political leadership.
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