I have been saying that this populist backlash goes against corporations too and has a leftist undertone.
Yes it can go left or right. One of the few positive things you can say about Trump is that he's so rich and can so easily get himself all over the media for free that he doesn't need to rely on donations from wealthy folks and corps/groups, so he is completely free to do whatever he wants and doesn't have to answer to his donors.
Unfortunately the rest of the congress can't say that, so they have to vote based on funding interests (bribes) that their election campaigns depend on.
Bernie Sanders just happens to be one of those very rare politicians that isnt super wealthy and has very high ethics to not take those bribes, so he can do different things against corporate interests like Trump can, though maybe even moreso since Trump himself is a corporation.