Ira talks to Tom, who regrets his vote on Brexit this week. And Zoe Chace talks to Harry Enten, a senior analyst at the website FiveThirtyEight, about Donald Trump. When Trump announced his campaign for the presidency in June 2015, pundits dismissed him and pollsters said the numbers proved he'd never win the nomination. Only that's not at all what they showed! Trump was in the lead. Enten explains what they all missed. (13 minutes)