Question: which president introduced the philadelphia plan which provided the framework for affirmative action
[{'answer': 'Nixon', 'provenance': [{'wikipedia_id': '6677413', 'title': 'Affirmative action in the United States', 'start_paragraph_id': 23, 'start_character': 526, 'end_paragraph_id': 23, 'end_character': 531, 'bleu_score': 1.0, 'section': 'Section::::History.:Eisenhower administration.\n'}]}, {'provenance': [{'wikipedia_id': '6677413', 'title': 'Affirmative action in the United States', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 238, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 117366329803313646}, 'section': 'Section::::History.:Nixon administration.\n'}]}]