Sen. John Kerry's campaign biographer Douglas Brinkley said Sunday that if an ongoing Navy investigation into Kerry's military decorations turns up evidence of "purposeful" deception, it could spell doom for the top Democrat's White House bid. Praising reporter Thomas Lipscomb, who broke news of the Navy investigation on Friday, Brinkley told WABC Radio's Steve Malzberg, "Journalists are going to have to see whether there's a discrepancy on [the citations posted to Kerry's] web site - whether there's something wrong that's said there or not." "If so," said the "Tour of Duty" author, "Kerry would have to fix it immediately -...