If New Republic can be said to be "radically" anything, it would be radically centrist. To the right of Harpers, but about the same as Atlantic Monthly.

Does that help any?

Dicho, if you haven't any idea of who the comedians in question are, or of any of the African American cultural issues raised in the article, what makes you think you are qualified to "teach" people about the blackface minstrel tradition. If anything, my opinion of what you are doing plummeted when I read that you have no inkling of who they are, and that New Republic might be radically left, I conclude that you are a person with precious little knowledge of the political realities involved in "teaching" people about the blackface minstrel tradition by performing coon songs.