How many Democrat governors has Tennessee had since 2000?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q5', 'id': 1, 'label': 'human'}, {'type': 'INTERNAL', 'name_': 'Q310295', 'id': 2, 'label': 'Dick Van Dyke'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q29552', 'id': 3, 'label': 'Democratic Party'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1509', 'id': 4, 'label': 'Tennessee'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q8075227', 'id': 5, 'label': 'Category:Births in Tennessee'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P150', 'source': 0, 'target': 4, 'label': 'contains the administrative territorial entity'}, {'name_': 'P27', 'source': 2, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P31', 'source': 2, 'target': 1, 'label': 'instance of'}, {'name_': 'P1142', 'source': 2, 'target': 3, 'label': 'political ideology'}, {'name_': 'P17', 'source': 3, 'target': 0, 'label': 'country'}, {'name_': 'P4224', 'source': 5, 'target': 1, 'label': 'category contains'}, {'name_': 'P971', 'source': 5, 'target': 4, 'label': 'category combines topics'}]}