Question: who was assassinated in 1968 while campaigning for the presidency
[{'answer': 'Robert F. Kennedy', 'provenance': [{'wikipedia_id': '40567', 'title': '1968 United States presidential election', 'start_paragraph_id': 2, 'start_character': 284, 'end_paragraph_id': 2, 'end_character': 301, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40567', 'title': '1968 United States presidential election', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 899, 'bleu_score': 0.946865113562467, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5880306034932722021}, 'section': 'Section::::Abstract.'}]}]