Since Trump's surprising win in the 2016 presidential election, there's been a flurry of discussion about why things turned out this way. But which explanations are well-supported, and which are wrong (or simply rationalizations)? This episode features political scientist Brendan Nyhan, who talks with Julia about questions like: Were the polls and models wrong? If so, why? How surprised should we have been by Trump's win? And why didn't the markets react badly to it?