Question: who ran in the presidential election of 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': 'Al Smith', 'provenance': [{'wikipedia_id': '40538', 'title': '1928 United States presidential election', 'start_paragraph_id': 1, 'start_character': 221, 'end_paragraph_id': 1, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Norman Thomas'}, {'answer': 'William Z . Foster'}, {'answer': 'Verne L. Reynolds'}, {'answer': 'William F. Varney', 'provenance': [{'wikipedia_id': '40538', 'title': '1928 United States presidential election', 'start_paragraph_id': 19, 'start_character': 344, 'end_paragraph_id': 19, 'end_character': 361, 'bleu_score': 1.0, 'section': 'Section::::Nominations.:Prohibition Party nomination.\n'}]}, {'answer': 'Frank Webb'}]