How was it possible that the Literary Digest erroneously predicted that Republican Alf Landon would beat incumbent Democrat Franklin Roosevelt in his 1936 bid for reelection,despite having obtained over 2 million responses to its poll?

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The Answer of How was it possible that the Literary Digest erroneously predicted that Republican Alf Landon would beat incumbent Democrat Franklin Roosevelt in his 1936 bid for reelection,despite having obtained over 2 million responses to its poll?

How Was It Possible That the Literary Digest Erroneously Predicted