Question: who was elected president of the united states in 1928
[{'answer': 'Herbert Hoover', 'provenance': [{'wikipedia_id': '40538', 'title': '1928 United States presidential election', 'start_paragraph_id': 1, 'start_character': 164, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Republican Secretary of Commerce Herbert Hoover'}, {'provenance': [{'wikipedia_id': '40538', 'title': '1928 United States presidential election', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 315, 'bleu_score': 0.957870874785216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17101803367995355586}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40538', 'title': '1928 United States presidential election', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Republican Secretary of Commerce Herbert Hoover defeated the Democratic nominee, Governor Al Smith of New York', 'Herbert Hoover', 'The United States presidential election of 1928 was the 36th quadrennial presidential election, held on Tuesday, November 6, 1928. Republican Secretary of Commerce Herbert Hoover defeated the Democratic nominee, Governor Al Smith of New York. Hoover was the last Republican to win a presidential election until 1952.']}}]}, {'provenance': [{'wikipedia_id': '51874996', 'title': '1928 United States presidential election in Minnesota', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['The Republican candidate, Secretary of Commerce Herbert Hoover won the state over New York governor Al Smith by a margin of 164,526 votes, or 16.94 percent.', 'Herbert Hoover', 'The 1928 United States presidential election in Minnesota took place on November 6, 1928, in Minnesota as part of the 1928 United States presidential election. The Republican candidate, Secretary of Commerce Herbert Hoover won the state over New York governor Al Smith by a margin of 164,526 votes, or 16.94 percent.']}}]}]