What was the big problem with the Literary Digest poll done in 1936?

Name: What was the big problem with the Literary Digest poll done in 1936?
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Question

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The Literary Digest poll of 1936 famously failed to predict the outcome of the presidential election because it sampled a population that was not representative of the broader electorate, notably excluding or underrepresenting lower-income individuals. This skewed the results significantly, leading to incorrect predictions.

What Was the Big Problem with the Literary Digest Poll