Question: Who once led a campaign for the musical artist who once toured with Sufjan Steven's?
{'answer': 'Nabil Ayers', 'supporting_facts': [['Nabil Ayers', 0], ['Nabil Ayers', 1], ['Nabil Ayers', 2], ['Nabil Ayers', 3], ['St. Vincent (musician)', 0], ['St. Vincent (musician)', 1], ['St. Vincent (musician)', 2]]}