Question: whose leadership on the supreme court helped strengthen the power of the federal government
[{'answer': 'John Marshall', 'provenance': [{'wikipedia_id': '21825423', 'title': 'John Marshall', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]