Question: who did the populists nominate as their presidential candidate in 1892
[{'answer': 'James B. Weaver', 'provenance': [{'wikipedia_id': '177019', 'title': "People's Party (United States)", 'start_paragraph_id': 3, 'start_character': 58, 'end_paragraph_id': 3, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]