GREENBELT, Md. - Nigeria's vice president sought up to $500,000 and a stake in a technology venture in his country, according to statements Rep. William Jefferson (news, bio, voting record) made to an FBI informant that were detailed in court documents filed in a bribery probe of the congressman. Jefferson allegedly told the FBI informant that he had delivered "African art," which authorities believe was code for cash, to the Potomac, Md., home of the wife of Nigerian Vice President Atiku Abubakar at midnight last July 31. Details of the alleged deal were included in an affidavit filed in U.S....