Baghdad - Insurgents have killed at least a dozen people in the rebel campaign to frighten Iraqis away from participating in the weekend election. In attacks on designated polling stations and troops around the country yesterday, a score of Iraqis were killed or hurt. One US soldier was killed and five were injured. And as part of an intensifying campaign of intimidation, an al-Qaeda affiliate led by Jordanian terror mastermind Abu Musab al-Zarqawi posted a videotape on the Internet showing the murder of a candidate from the party of interim Prime Minister Ayad Allawi. The tape included a warning to...