FREDERICKSBURG, Va. -- She calls herself the "mom-in-chief," but listen carefully and first lady Michelle Obama sounds more like the "defender-in-chief."Republicans charge that President Obama has resorted to character attacks on Mitt Romney because, they say, "he can't talk about his own record." But while the president crisscrosses the country explaining how his vision differs from his rival's, his wife is using her campaign appearances to defend his record.Speaking to a raucous crowd in a gymnasium at the University of Mary Washington on Thursday...

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