Factbox: Candidates in Colombia’s presidential election

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(Reuters) – Colombian President Juan Manuel Santos and right-wing economist Oscar Ivan Zuluaga go into Sunday’s presidential election neck-and-neck in polls, meaning a second-round runoff in June is likely. The main campaign issue has been peace talks with Marxist guerrillas that Santos launched in 2012 in hope of ending a 50-year civil war. The following are the main candidates: JUAN MANUEL SANTOS As defense minister for former President Alvaro Uribe, Santos led a successful campaign against the Revolutionary Armed Forces of Colombia (FARC) rebels. Santos and Uribe were allies but Santos broke with his former mentor after his 2010 election victory and later opened peace talks with FARC.