Question: when did the popular vote for president begin
[{'answer': '1789', 'provenance': [{'wikipedia_id': '21491579', 'title': 'United States presidential election', 'start_paragraph_id': 8, 'start_character': 279, 'end_paragraph_id': 8, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '21491579', 'title': 'United States presidential election', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 444, 'bleu_score': 0.625940442010268, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9424293398371622718}, 'section': 'Section::::History.\n'}]}]