Ray Nagin, the former two-term mayor of New Orleans indicted after he left office, was convicted Wednesday of 20 federal corruption charges, stemming from illegal dealings with city vendors dating back to 2004. A jury delivered the verdict just before 1 p.m. after roughly six hours of deliberations that followed a nine-day trial. Nagin showed little or no emotion when the verdict was read. He sat in a courtroom chair staring ahead as his wife, Seletha Nagin, sobbed. Relatives tried to console her.