You are probably thinking of this...
http://www.snopes.com/politics/satire/gop.asp
Not the same thing. I'm not sure about the chart to be frank. It wouldn't surprise me if it's true. Obviously what states are red and blue is true. I'm 99% sure the Southern states have lower avg. IQs too. I thought NV was lower though.
http://www.sq.4mg.com/IQ-States.htm