Question: which two us senators proposed and helped pass the investment platform roth ira
[{'answer': 'Senator Bob Packwood of Oregon', 'provenance': [{'wikipedia_id': '402261', 'title': 'Roth IRA', 'start_paragraph_id': 6, 'start_character': 58, 'end_paragraph_id': 6, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'Senator William Roth of Delaware', 'provenance': [{'wikipedia_id': '402261', 'title': 'Roth IRA', 'start_paragraph_id': 6, 'start_character': 93, 'end_paragraph_id': 6, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '402261', 'title': 'Roth IRA', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 324, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14757160777642157827}, 'section': 'Section::::History.\n'}]}]