Populism is an oft-discussed topic in political circles of all stripes, and us dissidents tend to look at it as the best chance at present to put any sort of identitarian ideas into the mainstream, or at the very least as the best chance of stopping mass migration. I wrote a report on the state of populism in Europe not long ago for that very reason.
As I said in that article, there is no “fixed” populist platform; merely a handful of ideas that unite parties under the populist label. These are mainly anti-elitism, anti-immigration, and an appeal in some form to disprivileged native populations. Quite often, it is also simply a matter of the media deciding to call someone or some party populist.