Conversation with Manmohan Singh was always fascinating at the time he was prime minister of India. It was difficult to challenge his superior intellect. He could, in his calm, disciplined way, out-argue anyone. He saw where India was going with a degree of exactness that dwarfed other observers. On the economic front it was, for his Congress Party government, all about ending poverty which he thought doable, although achieving a fairer income distribution was much more difficult. On the political front it was all about catching up with China which three decades ago had been on the same level as India but was now way ahead. And it was about making peace with its nuclear-armed adversary, Pakistan. In the election, which India is now in the middle of, the issues remain the same, except that the incumbent right wing prime minister, Narendra Modi adds his own twist and interpretations. He...