With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Carson opposed the Vietnam War, and capital punishment, favored racial equality, and was against criminalizing extramarital sex and pornography. He avoided explicitly mentioning his views on "The Tonight Show," saying he "hates to be pinned down" as that would "hurt me as an entertainer, which is what I am." As he explained in 1970, "In my living room I would argue for liberalization of abortion laws, divorce laws, and there are times when I would like to express a view on the air. I would love to have taken on Billy Graham. But I'm on TV five nights a week; I have nothing to gain by it and everything to lose." He also seldom invited political figures onto the "Tonight Show" because he " didn't want the viewer's political opinions changed by Carson's tone or questions ".
text_B: Did regular viewers of Carson's Tonight Show know his political views of the US Presidents that served while he was on the air?  Answer: NO
DON'T KNOW.