question: Which incumbent U.S. presidents since 1950 ran for a second term but did not win?
answerText: Gerald R Ford, Jimmy Carter, George H W Bush, and Donald Trump.
questionEntity.name: Q30
questionEntity.entityType: entity
questionEntity.label: United States of America
questionEntity.mention: U.S.
questionEntity.name: 1950
questionEntity.entityType: date
questionEntity.mention: 1950
questionEntity.name: 2
questionEntity.entityType: ordinal
questionEntity.mention: second
answerEntity.name: Q9582
answerEntity.label: Gerald Ford
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answerEntity.label: Jimmy Carter
answerEntity.name: Q23505
answerEntity.label: George H. W. Bush
answerEntity.name: Q22686
answerEntity.label: Donald Trump