Narendra Modi leaned to whisper in the ear of the man sitting cross-legged and barefoot next to him, the one clad in saffron robes with a long beard and squinty gaze. It was late in the afternoon of March 23, 2014 in New Delhi and the start of national elections was a fortnight away.

A few minutes later, the yoga guru and entrepreneur known as Baba Ramdev turned to a microphone and urged the crowd before him to mobilize votes for Modi: "You'll make other people understand, won't you? You won't sit at home, will you?" The crowd roared back, "No!"

Modi grinned. Ramdev laughed. The politician and the co-founder of a billion-dollar consumer products business were both headed to the pinnacle of a right-wing Hindu movement that seeks to shape the destiny of the world's fastest-growing major economy. About two months after the rally, when voting had rolled across the vast country, Modi's Bharatiya Janata Party swept the long-ruling Congress from power.

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