SANTA MONICA -- If she'd been just another wild child of a baby boom generation that produced so many, Patti Davis muses, none of it would have mattered so much. Sure, she did her share of recreational drugs, but in the 1960s and 1970s, what young person didn't? There was more, of course: posing naked in Playboy magazine, a string of bad love affairs, speeches at anti-war rallies. There was a difference, though. While Davis the protester denounced war at those rallies in the 1980s, other demonstrators denounced her father, President Reagan. "I regret all of it," says Davis, who...