A more useful definition of 'populism' with regard to American history and politics is closer to "torches and pitchforks at the ballot box," i.e., demagoguery resulting in wealth transfers and currency ruin.
This "support for the concerns of ordinary people" is what the American government ought to reflect, subject to law and the Constitution. This means that no, we ought not nationalize industries because people "need" this or that, but it means yes, we absolutely ought to seal our border and deport anyone illegally in our midst. This second one alone -- which has been the wish of the ordinary people -- has been ignored for decades, and is the single greatest factor in explaining Trump and his success thus far.
We let main stream media convince us that fight was over and we could sit back and ignore politics, wow, we were wrong but to be fair we were scammed by a pack of plotted and schemed lies, no accident, an act of purposeful political corruption, with intent to defraud democracy. People should be going to jail for what they did and what they continue to do.
When the Government Orders You to Burn Your Crops