Twenty minutes from the town of Mohanganj, Rahul Gandhi’s convoy of vehicles came to a halt and the politician stopped to eat lunch. The man heading the Congress Party’s campaign to form India’s next government had arrived a couple of hours earlier from Delhi in a privately chartered plane and delivered a 20-minute speech at a modestly attended rally. But if he was keen to press on to the next engagement or use his limited time to interact with more potential voters, he did not show it; as his police bodyguards kept both the media and public at bay, a cool-box was lifted from the rear of Mr Gandhi’s white SUV and for 20 minutes or so he paused under the shade of a sprawling tree. He declined…