It can’t often happen that prime ministers from two different countries together address the same audience of tens of thousands, both of them looking to the same people for votes and other political support. Even more remarkable is that the two politicians use the event to build a hitherto non-existent personal bond and to enlarge business and other links between their countries. That was what developed on Nov. 14 at London’s vast Wembley Stadium in London when David Cameron, British prime minister, cashed in on a mega event organized by overseas Indians in the UK to welcome their hero, Narendra Modi, India’s prime minister.