Why Exit Polls Failed In Key States

The exit polls predicted a massive win for the BJP and its coalition but they have been way off the mark. Uttar Pradesh, Maharashtra, Bengal - three states that send the highest number of members of Parliament turned up with results that showed just how much off-target pollsters had been. So what went wrong? TOI's Sanjiv Shankaran tells Ketki Angre one fundamental mistake that could have turned the tables on pollsters in this election.