Question: when is the president of the senate allowed to vote
[{'answer': 'If the vote is tied', 'provenance': [{'wikipedia_id': '3057888', 'title': 'Standing Rules of the United States Senate', 'start_paragraph_id': 8, 'start_character': 944, 'end_paragraph_id': 8, 'end_character': 963, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3057888', 'title': 'Standing Rules of the United States Senate', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1113, 'bleu_score': 0.989873091526375, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8820995249935588114}, 'section': 'Section::::Abstract.'}]}]