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Assuming you're referring to this question:

Did political analyst, Larry Sabato ever say "The higher the education level, the more likely they are to vote Democratic."?

As you see, the question is not put on hold or closed as off-topic and you've got two answers. Your question has also has a rate of +2, which is not bad.

Asking about the authenticity of any quote is on-topic as you see here; there are 122 questions.

However, there are many cases where the community dislikes the question, maybe because sometimes it doesn't really matter whether X said Y or maybe because the OP already found evidence while asking the question.

There could many reasons why your question was not well received and one reason has been explained by Oddthinking:

I don't know why it was downvoted, but I wonder if it is because there is little reason for doubt here. The idea that he said it is a fairly prosaic claim. The Politifact article discusses how they actually asked Sabato to substantiate the quote, and he did so, in a way that they conclude is "Mostly True". Why wouldn't you provisionally accept this rather prosaic claim as true, given the substantial evidence you've already discovered?