America's main ally in the War on Terror, Pervez Musharraf, has stepped down after eight years as the president of Pakistan. Asif Ali Zardari, the man likely to succeed him, is the leader of the Pakistan People's Party. Owen Bennett-Jones speaks to Zardari about what steps he will take to tackle extremists and insurgents in his country and if his campaign may be plagued by the corruption charges he faced in the past.