CHICAGO - Late on a balmy Friday night in Wicker Park, a gentrifying neighborhood just northwest of the Loop, a small tribe of 20-somethings gathers outside a corner bar. Their leader, a petite, energetic 25-year-old named Meghann Walker, hands out leaflets to people heading inside. "Do you guys know Ron Paul is going to be in town tomorrow?" Walker asks a short-haired young woman in jeans and flip-flops. "There'll be a lot of good people there, that's for sure."