Joe Biden has been a public figure for decades but he's far from an open book. For a man who has been in national politics since the age of 29 and has made multiple attempts at the presidency (third time's a charm) it's remarkable how much he has been willing to change. In a conversation with Ian Bremmer on GZERO World, Biden biographer and New Yorker staff writer Evan Osnos provides a deep dive into the life, legacy and potential presidency of the next leader of the free world.