Question: who ran against obama in his first election
[{'answer': 'John McCain', 'provenance': [{'wikipedia_id': '406859', 'title': '2008 United States presidential election', 'start_paragraph_id': 1, 'start_character': 284, 'end_paragraph_id': 1, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '406859', 'title': '2008 United States presidential election', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 442, 'bleu_score': 0.628294067860911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10801876345056830931}, 'section': 'Section::::Abstract.'}]}]