Venezuelan President Maduro leads rival May Day rally in Caracas Venezuela opposition leader Henrique Capriles announced Wednesday he would formally contest results from last month's presidential poll, during a May Day rally in Caracas. President Nicolas Maduro led a rival march in central and western Caracas -- a last minute route change to avoid a confrontation with opposition marchers, who chose a major road in the east of the capital for their demonstration. Images of government rally. Images.