What was the main reason why the Literary Digest eventually failed to predict the outcome of a presidential election?

Question

Quizplus · Accepted Answer

The main reason why the Literary Digest eventually failed to predict the outcome of a presidential election was an unrepresentative sample. The magazine relied on its own subscriber list, which consisted mainly of affluent and conservative individuals, leading to a biased sample that did not accurately reflect the population as a whole.

What Was the Main Reason Why the Literary Digest Eventually