Question: who became chief justice of the supreme court after serving as president
[{'answer': 'William Howard Taft', 'provenance': [{'wikipedia_id': '33522', 'title': 'William Howard Taft', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '33522', 'title': 'William Howard Taft', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 571, 'bleu_score': 0.8809147538185351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1797698266720842697}, 'section': 'Section::::Abstract.'}]}]