Question: chief justice of the supreme court political party
[{'answer': 'conservative', 'provenance': [{'wikipedia_id': '1928850', 'title': 'John Roberts', 'start_paragraph_id': 1, 'start_character': 400, 'end_paragraph_id': 1, 'end_character': 412, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]