This episode of Panorama meets American statistician Nate Silver, who shot to fame by correctly predicting the outcome of the past two US presidential elections, state by state. Now he's in the UK to pretty much do the same. Reporter Richard Bacon takes him on a road trip around the country, meeting voters from all political persuasions and backgrounds. With just 10 days before polling day in one of the most uncertain British elections in decades, can this guy correctly forecast which way it will go?