Why do lefties dominate Presidential politics?

Ford, Reagan, Bush I, Clinton, Gore, and now Obama and McCain are all left-handed.  Call it chance or availability bias, but I’m still wondering.  Read more here, and thanks to Martin Weil for the pointer.  Here’s one on-line discussion.  Here is a brief survey on Wikipedia.  It is my general view that left-handers have higher genetic variance in a number of dimensions, so they should be over-represented in many different kinds of extreme situations, including the Presidency. 


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