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The socialist government of Venezuela presides over an economy in meltdown and a population desperate for change. Yet the country's opposition has failed to build a movement capable of bringing down president Nicolas Maduro. Why? In an exclusive interview, Stephen Sackur speaks to the founder of the Popular Will opposition party Leopoldo Lopez. Last month he escaped from Venezuela and found refuge in Spain. Is that the action of man whose lost faith in the opposition's ability to win their struggle?