Colombians are electing a new Congress amid tight security. There are fears Marxist guerrillas, who have paralysed parts of the country, will disrupt voting. Paramilitaries could also try to intimidate voters. The poll might give President Alvaro Uribe his first working majority in the country’s Congress. The election may also signal the likely result of the presidential contest on 28 May, where the incumbent is the favourite to win.Full Story