Question: who calls a special election to fill a vacancy in the senate
[{'answer': 'the governor', 'provenance': [{'wikipedia_id': '11961899', 'title': 'List of special elections to the United States Senate', 'start_paragraph_id': 5, 'start_character': 39, 'end_paragraph_id': 5, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Appointments by Governors.\n'}]}, {'provenance': [{'wikipedia_id': '11961899', 'title': 'List of special elections to the United States Senate', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 667, 'bleu_score': 0.9829771687435411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15842357242513010161}, 'section': 'Section::::Appointments by Governors.\n'}]}]