Brazilians head to the polls Sunday in a bitterly-contested election.<br/> <br />Final polls give incumbent Dilma Rousseff the edge as she seeks her second term leading Latin America's largest economy.<br/> <br />Her Workers' Party has held power for 12 years -- leveraging an economic boom to expand social programs that helped lift more than 40 million people from poverty.<br/> <br />But she's facing a tough race against former State Governor Aecio Neves, who wants to adopt more market-friendly fiscal measures to rein in public spending.<br/> <br />The race is Brazil's most competitive presidential campaign in decades.<br/> <br />It is also the most acrimonious, dominated by negative advertising and a steady drum beat of corruption allegations.<br/> <br />Brazilians vote in a bitterly-contested election that pits a leftist president against a centrist senator who is promising pro-business policies. Vanessa Johnston reports.<br/> <br />Brazil votes in tight presidential runoff
