Mexicans are voting on Sunday to elect their new president. Also on the ballot are congressional, senatorial, local state seats. Leading the polls by a considerable margin is Andres Manuel Lopez Obrador, followed by Ricardo Anaya second and Jose Antonio Meade third, with independent Jaime "El Bronco" Rodriguez a distant fourth. The four main candidates have sparred over key issues of corruption, security and the economy. Our Alaisdair Baverstock has more on Obrador's platform.