http://www.kids-iq-tests.com/d-prez.htmlYou can vaguely estimate IQ from LSAT. The average LSAT in harvard law is 171, or 138 IQ. Since Obama was top of his class his is probably 150 or so.
I do not write off IQ as I think it is a very valid measurement of your ability to comprehend and understand issues you face. But it is not the end all. Based on Bush's SAT scores his IQ is about 125. Cheney's IQ is likely far higher. But neither is qualified to be president. Clinton combined high IQ with good judgment and competent leadership.