At a weekend pep rally in Washington, a thousand college Republicans clap, cheer and party -- and reveal a troubling dark side. Just as presidential Svengali Karl Rove, dressed in a light-gray suit and mint-green striped tie, began to speak Friday at a gala dinner for college Republicans in Washington, piercing whistles sounded. A half-dozen protesters had made their way into the auditorium, and they began to chant something inaudible about George Bush and death. Security staffers ejected them within seconds, but even before they were out the door, hundreds of clean-cut collegians were on their feet, shouting "KARL!...