BOGOTA, June 5 (Reuters) - Colombia's President Juan Manuel Santos and rival Oscar Ivan Zuluaga were neck-and-neck in a Gallup poll of voters published by local media on Thursday, before a June 15 run-off election centered on how to end 50 years of civil war.
Right-wing economist Zuluaga had a narrow lead with 48.5 percent, versus 47.7 percent for the president, but the pair are effectively tied given the poll's margin of error. (Reporting by Peter Murphy and Luis Jaime Acosta; Editing by Andrew Cawthorne and Eric Walsh)
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