Washington Post: There were snickers aplenty here last week when General Motors joined hands with an Illinois company to announce a major biofuels initiative. Cynics in the audience at the 2008 North American International Auto Show joked that the union between giant GM and relatively small Coskata has about as much chance of succeeding as a Hollywood marriage. Others found smug comfort in the theory that the whole GM-Coskata affair was little more than a green publicity stunt. Admittedly, on …