Question: who tried to prevent the march on washington
[{'answer': 'President Roosevelt', 'provenance': [{'wikipedia_id': '20392542', 'title': 'March on Washington Movement', 'start_paragraph_id': 1, 'start_character': 317, 'end_paragraph_id': 1, 'end_character': 336, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20392542', 'title': 'March on Washington Movement', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 508, 'bleu_score': 0.9267806344830251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10776336872222923689}, 'section': 'Section::::Abstract.'}]}]