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So I understand your disagreement: NPR is not generally going to criticize our system of capitalism. After all, many liberals - particularly the opinion-making elite - are thriving in this system.
But they will always approach cultural issues from the left liberal point-of-view. Recently, NPR Opinion has swung even more to the left: just listen to their afternoon talk shows. All Things Considered and Morning Edition have not gone as far, and are more center or center-left. Allsides, the media bias organization, agrees and rates NPR opinion as "Left" and NPR News as "Centrist":