Is populism a threat to democracy?

In the aftermath of the Cold War, the consensus of Western politics was that more countries would evolve into liberal democracies and stay that way. The European Union was seen as the model but, this week, Italy's centrist Prime Minister was driven from office -- hard on the heels of Brexit. Matteo Renzi announced his resignation after losing a referendum to restructure a famously chaotic government. There's right-wing nationalism in France and Germany -- and Donald Trump won by directly assaulting America's political establishment. We look at evidence that liberal democracies aren't as stable as they were previously cracked up to be.