Not only is Clegg, who turned 41 last week, the youngest of the major party leaders, but he also has something of a blot on his copybook, which may endear him to the younger generation. The 16-year-old Clegg was arrested along with a friend in Munich, Germany, for setting fire to rare cacti belonging to a professor, and sentenced to community service digging gardens. "I got into trouble, as I think a lot of teenagers do," Clegg admits. "I was...