What did the famous 1936 literary digest straw poll fail to predict?

The famous 1936 Literary Digest straw poll failed to predict the outcome of the presidential election, incorrectly forecasting that Republican candidate Alf Landon would defeat incumbent Democrat Franklin D. Roosevelt. The poll's methodology relied on surveys sent to a self-selected group of magazine subscribers and automobile owners, which biased its results towards wealthier voters. This misrepresentation of public sentiment highlighted the inadequacies of straw polls and led to a greater emphasis on more scientific polling methods in future elections. Ultimately, Roosevelt won in a landslide, securing over 60% of the popular vote.