It calls to mind St. Augustine, who was an ex-Manichee but never totally escaped --- until Heaven, I suppose--- some of the distorting features of Mani.
Ah well. As Oscar Wilde said: "Every saint has a past. And every sinner has a future."
I could never equate or even think of the two as similar. Augustine rejected Manichaeism.
Day doesn't seem to have rejected her radicalism. The bohemian lifestyle, yes, but not the philosophy of Gov't.