As Zero says, this does not necessarily prove anything, unless you can show a link. If you compare coastal states to heartland states you will find all sorts of such divisions- productivity, population, finances...
More telling are voter feedback statistics, and most certainly Kerry got the graduate vote. Also the young vote, and I believe (but have no facts to hand right now) that the young-to-old ratio is much higher in the blue states also.
So right now, all we have is "Kerry votes come from places that are more likely to produce people with higher standard IQ test results," rather than "smart people voted for Kerry, dumb for Bush."
Meanwhile... are they SURE Minnesota has an average IQ of 85? That's ridiculous; that's a result you would expect from a poverty-stricken Eastern European country.
BTW, The Economist, I read, has retracted this piece on the grounds that they could not independantly verify it.