The Literary Digest poll of 1936 failed because of which of the following problems?

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The Literary Digest poll of 1936 failed because the sample was unrepresentative. The poll relied on telephone and automobile registration lists, which at the time skewed towards wealthier voters who were more likely to vote Republican. As a result, the poll inaccurately predicted a Republican victory in the presidential election, while in reality, Franklin D. Roosevelt won in a landslide.

The Literary Digest Poll of 1936 Failed Because of Which