Just weeks ago, the result of Brazil's presidential election this coming Sunday seemed a foregone conclusion. But now, a second term for incumbent Dilma Rousseff is looking far from certain. She's facing a strong challenge from opposition candidate Marina Silva. Our correspondents Nicolas Ransom and Kele Da Silva travelled to the small town of Primavera in north-eastern Brazil, where they found signs that the political tide could be turning.
Programme prepared by Elise Duffau and Patrick Lovett

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