Disqualified

http://commons.wikimedia.org/wiki/File:Wendell_Willkie_presidential_campaign_poster_1940_crop.jpg

From Clark Kinnaird’s Encyclopedia of Puzzles and Pastimes, 1946:

Though a great American, Wendell Willkie nevertheless lacked one of the four necessary requirements for becoming President of the United States. One must be at least 35, a native-born American, and a resident of the U.S.A. for at least 14 years. Name the fourth requirement which Willkie also lacked?

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