Question: who was the only u.s. president and vice-president never elected to either office
[{'answer': 'Gerald Rudolph Ford Jr.', 'provenance': [{'wikipedia_id': '5030380', 'title': 'Gerald Ford', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]