If you think it takes an Einstein-level intellect to run the most powerful nation in the world, think again. While many assume politics seems to draw in those with the highest IQ levels, the most book-smart or brilliant politicians sometimes make headlines for their blunders instead. Our curiosity about IQ’s role in our political leaders has led to extensive research. We wondered how intelligent United States Presidents were throughout history. While the media circus continues to surround the White House, we wanted to step away and examine America’s Presidents and their intelligence. During our research, we came across a 2006 academic paper written by Dean Keith Simonton, a psychologist at the University of California, Davis of which the presidential IQs presented here are based on. Because most presidents' IQ test results were unavailable, Simonton utilized a historiometric technique to evaluate their performance. Which presidents held the highest IQs, and how did their smarts affect their decision-making as leaders of America? The results may surprise you! Images of U.S. presidents are from the National Portrait Gallery in Washington, D.C.