WEST ALLIS, Wis. — She's never in a bad mood, says one member of her Secret Service detail. She's "cordial," Robert Haugh says, putting away the silverware on the blue-and-white C-9 Air Force jet that has been home to the first lady and her 22-year-old twin daughters, Jenna and Barbara, for the past few weeks. "You can't ask for anything more," Mr. Haugh says of Laura Bush, who may prove to be the real "October surprise" of the 2004 presidential campaign. She is described by President Bush as his "secret weapon" and by daughter Jenna as "a role...