Question: what is the political system that the united states follows in regards to elections
[{'answer': 'a primary election system', 'provenance': [{'wikipedia_id': '169131', 'title': 'Primary election', 'start_paragraph_id': 17, 'start_character': 91, 'end_paragraph_id': 17, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Primaries in the United States.\n'}]}, {'provenance': [{'wikipedia_id': '169131', 'title': 'Primary election', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 979, 'bleu_score': 0.9766581194053251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10419550047238139215}, 'section': 'Section::::Primaries in the United States.\n'}]}]