Sen. Hillary Rodham Clinton is staying silent as top Democratic senators demand President Bush rule out a pardon for indicted top White House aide I. Lewis "Scooter" Libby — which could evoke memories of her and her husband's own Pardongate scandal. Party leaders — have written a letter to Bush urging that he promise not to pardon Libby, who has been charged with obstruction of justice and perjury in the CIA-leak case........Clinton ducked taking a position on the letter. Rekindled comparisons to Pardongate would open old wounds for the first lady, who is readying for re-election and eyeing a run...