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I haven't read the article, but if you can call the New Deal populist, then you can call anything populist; it makes the word useless.
There were several populist movements (left and right) at the time: Townsend, Huey Long, Father Coughlin. But perhaps it would be useful to have Chip's comment on those movements (if they were movements).
Carrol
P.S. Of course, I reject the concept of Progress and Progressivism. It implies that gains can be made in a step by step manner, as well as that such gains can be retained. Both concepts are empty. Given this reality, calling oneself a Progressive is at best empty.