GM's Barra knows nothing about anything

    The last time Congress convened hearings on an automotive safety scandal, during the early 2010 furor over sudden unintended acceleration in Toyotas, the crucial takeaway was how little members of Congress understood cars or the car business. This week, when General Motors Chief Executive Officer Mary Barra testified before committees about her company's safety scandal, the major impression was of how little she seemed to know about her own business.

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