Question: who championed reform and the constitution of 1857 in mexico
[{'answer': 'Juan Nepomuceno Álvarez Hurtado', 'provenance': [{'wikipedia_id': '27136577', 'title': 'Federal Constitution of the United Mexican States of 1857', 'start_paragraph_id': 4, 'start_character': 90, 'end_paragraph_id': 4, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '27136577', 'title': 'Federal Constitution of the United Mexican States of 1857', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 499, 'bleu_score': 0.974188104609039, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1163320530125380846}, 'section': 'Section::::Background.\n'}]}]