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It's a depressing ritual. Every four years, as Iowans prepare to cast the first votes in the presidential-primary season, candidates descend on the corn-covered state and discover the miraculous properties of ethanol. The latest convert is Fred Thompson, who voted against ethanol subsidies when he was a U.S. senator but now says that ethanol is "a matter ... of national security." Like most arguments for ethanol subsidies, this one ...