While there were celebrities aplenty, including Danny Glover, Jello Biafra and Eddie Vedder, it wasn't the stars that filled the stadium.Medea Benjamin, for example, founder of Global Exchange, got roars of approval warming up the crowd attacking everything from NAFTA to Nike. (She didn't mention that Glover's girlfriend, Gina Warren, works for the Swoosh.)But it wasn't until Nader walked onstage