A 31-year-old Florida man was arrested over the weekend in connection with impersonating an aide to Democratic presidential candidate John Edwards at a Martha's Vineyard fund-raiser, police said. Secret Service agents assisted in questioning Michael Duga after he allegedly showed a police officer a badge and card that identified him as chief of staff to former senator Max Cleland, a Georgia Democrat, according to a report by the Chilmark Police Department. The identification card Duga presented had his photograph and name engraved on it, police said. Someone named Michael Duga did at one time serve as an aide for Cleland,...