BOGOTA (Reuters) - Colombian front-running presidential candidates Juan Manuel Santos and Antanas Mockus remain tied in a poll released on Wednesday before the May 30 election, but Mockus holds the edge in a likely June runoff.

Santos, former defense minister for President Alvaro Uribe, would get 37.5 percent of intended votes in the first round, with Mockus, a former Bogota mayor, getting 35.4 percent, the Invamer-Gallup poll said.

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