Question: who used to be on the cbs evening news
[{'answer': 'Walter Leland Cronkite Jr .', 'provenance': [{'wikipedia_id': '167289', 'title': 'Walter Cronkite', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '167289', 'title': 'Walter Cronkite', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 325, 'bleu_score': 0.906944319610487, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16116911820913674611}, 'section': 'Section::::Abstract.'}]}]