Populism through a philosophical lens

There seem to be as many definitions of populism as there are researchers of it. As a concept it is widely used in the current European politics and therefore it deserves a thorough, even philosophical consideration of it. Helping us with that task is PhD student Tuukka Brunila from EuroStorie. How does populism relate to the de-politicization of certain questions? We have all heard of right-wing populism, but is there something called left-wing populism as well? If everything is political, how can we distinguish good policies from bad ones?