WASHINGTON While this year's presidential campaign has been marked by historic firsts, the nominations of senators McCain and Obama will renew one surprising trend: For the fifth time in the last 35 years, America will have a lefty in the White House. Both major party candidates are southpaws, contributing to a largely unexplained phenomenon that has vexed researchers and historians and drawn notice from a federal judge destined for the Supreme Court. Though left-handers comprise just 10% of the population, they are dominating presidential politics. Their recent success transcends ideology. Since 1974, presidents Ford, Reagan, George H.W. Bush,...

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