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Shirin Sadeghi Independent TV & Radio Host, ex-BBC & Al Jazeera When the mighty do not fall, they are felled, but Imran Khan is still going strong despite serious injuries this week at a campaign rally. He's come a long way since  I first interviewed him in 2011 : he's the most important person in Pakistan right now and the biggest election in his country's history is all about him. Unlike in the United States, campaigning in Pakistan has time limits and the brief period of campaigning ended Thursday at midnight with a massive Islamabad rally for Khan followed by a smaller rally for his main opponent: Mian Nawaz Sharif, the two-time former Prime Minister and head of the Pakistan Muslim League - Nawaz (PML-N) party. Sharif, sweating under the grand lights of his stage, with a combover lightly flapping in the night's breeze, and his microphone being held for him by a hand other than his, was -- as his campaign has been -- focused on Khan. Kha...