Question: which republicans senators are up for reelection in 2018
[{'answer': 'Jeff Flake', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 3, 'start_character': 270, 'end_paragraph_id': 3, 'end_character': 280, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Roger Wicker', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 95, 'start_character': 20, 'end_paragraph_id': 95, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Mississippi.\n'}]}, {'answer': 'Deb Fischer', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 111, 'start_character': 20, 'end_paragraph_id': 111, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Nebraska.\n'}]}, {'answer': 'Dean Heller', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 3, 'start_character': 184, 'end_paragraph_id': 3, 'end_character': 195, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ted Cruz', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 153, 'start_character': 20, 'end_paragraph_id': 153, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Texas.\n'}]}, {'answer': 'Orrin Hatch', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 159, 'start_character': 22, 'end_paragraph_id': 159, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Utah.\n'}]}, {'answer': 'John Barrasso', 'provenance': [{'wikipedia_id': '38680975', 'title': '2018 United States Senate elections', 'start_paragraph_id': 180, 'start_character': 20, 'end_paragraph_id': 180, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Wyoming.\n'}]}]