BOGOTA (Reuters) - Colombians were voting on Sunday in the tightest presidential election in decades, a contest that will decide if the nation moves ahead on peace talks with Marxist FARC rebels or step up its battlefield offensive to end a 50-year war.
President Juan Manuel Santos, who has cast the election as a choice between peace and war, faces right-wing challenger Oscar Ivan Zuluaga, a sceptic of talks, who nudged ahead of the incumbent in last month's first-round ballot.
