Question: who is running for us senate in az
[{'answer': 'Martha McSally', 'provenance': [{'wikipedia_id': '51043227', 'title': '2018 United States Senate election in Arizona', 'start_paragraph_id': 2, 'start_character': 102, 'end_paragraph_id': 2, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Kyrsten Sinema', 'provenance': [{'wikipedia_id': '51043227', 'title': '2018 United States Senate election in Arizona', 'start_paragraph_id': 2, 'start_character': 155, 'end_paragraph_id': 2, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]