Question: what type of election allows the party's voters to nominate candidates
[{'answer': 'primary election', 'provenance': [{'wikipedia_id': '169131', 'title': 'Primary election', 'start_paragraph_id': 2, 'start_character': 15, 'end_paragraph_id': 2, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]