How did a 'chai wallah' who sold tea on trains as a boy become Prime Minister of India? On May 16, 2014, Narendra Modi was declared the winner of the largest election ever conducted anywhere in the world, having fought a campaign unlike any before. Political parties in Britain, Australia and North America pride themselves on the sophistication of their election strategies, but Modi's campaign was a master-class in modern electioneering. His team created an election machine that broke new ground in the use of social media, the Internet, mobile phones and digital technologies. Modi took part in thousands of public events, but in such a vast country it was impossible to visit every town and village. The solution? A 'virtual Modi' - a life-size 3D hologram - beamed to parts he could not reach in person. These pioneering techniques brought millions of young people to the ballot box - the holy grail of election strategists everywhere - as Modi trounced the governing Congress Party led by the Gandhi dynasty. Former BBC correspondent and Downing Street communications expert Lance Price has been granted exclusive access to Prime Minister Narendra Modi and his team of advisers.