The Concertación is running Christian Democrat Eduardo Frei, the son of a former president who was president himself from 1994 until 2000. His opponent is Sebastián Piñera, a tycoon, former senator, and presidential runner-up in 2006 who represents the main opposition forces – Piñera’s moderately conservative Renovación Nacional (RN) and the more rightist Union Democrata Independiente (UDI).