The Hoax
The hoax email showed Bill Clinton having the highest IQ (182) and George W. Bush the lowest (91). However, the numbers claimed in the email were fabricated, and the sociologists and institutions (e.g., the "Lovenstein Institute") quoted in the article do not exist (a "Lovenstein Institute" website displays the "report", but it was created after the report's release). The techniques purportedly used to measure IQ of the presidents are not recognized means of measuring IQs. The hoax also contains other factual errors. When the hoax was debunked, it appeared to be a personal attack on Bush because of its timing and its listing Bush's IQ as exactly half that of Clinton's.
Read more about this topic: U.S. Presidential IQ Hoax