Question: when was the last time oklahoma voted for a democratic president
[{'answer': '1964', 'provenance': [{'wikipedia_id': '5928705', 'title': 'Politics of Oklahoma', 'start_paragraph_id': 4, 'start_character': 6, 'end_paragraph_id': 4, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Political history.\n'}]}]