There is a neo-populist movement afoot in the US right how. No one is sure exactly what to call it. Analogies with the original Populist party break down over issues of tariffs and xenophobia. The later "Progressive" movement, which is credited with creating the first round of government regulatory agencies, doesn't fit well either. It didn't have the broad-based working class foundation that is meant when one talks about populism.

These days when critics accuse liberals of engaging in "class warfare" they mean the the working classes are looking to rein in the excesses of the super wealthy. Since this group is tiny, the appeal to defending the rights of Paris Hilton doesn't work well, so they try to include the top 20% as well.