Who was West Virginia's longest serving senator?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q1371', 'id': 0, 'label': 'West Virginia'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q501800', 'id': 1, 'label': 'Kanawha County'}], 'links': [{'name_': 'P131', 'source': 1, 'target': 0, 'label': 'located in the administrative territorial entity'}]}