Question: who ensures that the states abide by constitutional and federal law
[{'answer': 'Supreme Court', 'provenance': [{'wikipedia_id': '33730953', 'title': 'Supremacy Clause', 'start_paragraph_id': 10, 'start_character': 493, 'end_paragraph_id': 10, 'end_character': 506, 'bleu_score': 1.0, 'section': 'Section::::Preemption doctrine.\n'}]}, {'provenance': [{'wikipedia_id': '33730953', 'title': 'Supremacy Clause', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 602, 'bleu_score': 0.948891840545617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8756941984555018453}, 'section': 'Section::::Preemption doctrine.\n'}]}]