Who was the first Hispanic senator in United States?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'INTERNAL', 'name_': 'Q771', 'id': 1, 'label': 'Massachusetts'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q35657', 'id': 2, 'label': 'state of the United States'}, {'type': 'INTERNAL', 'name_': 'Q1408', 'id': 3, 'label': 'New Jersey'}, {'type': 'INTERNAL', 'name_': 'Q846570', 'id': 4, 'label': 'Americans'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1211934', 'id': 5, 'label': 'Hispanic'}, {'type': 'INTERNAL', 'name_': 'Q4761429', 'id': 6, 'label': 'Andy Unanue'}, {'type': 'INTERNAL', 'name_': 'Q8247946', 'id': 7, 'label': 'Category:American scientists by state'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P150', 'source': 0, 'target': 1, 'label': 'contains the administrative territorial entity'}, {'name_': 'P150', 'source': 0, 'target': 3, 'label': 'contains the administrative territorial entity'}, {'name_': 'P17', 'source': 1, 'target': 0, 'label': 'country'}, {'name_': 'P31', 'source': 1, 'target': 2, 'label': 'instance of'}, {'name_': 'P17', 'source': 3, 'target': 0, 'label': 'country'}, {'name_': 'P31', 'source': 3, 'target': 2, 'label': 'instance of'}, {'name_': 'P17', 'source': 4, 'target': 0, 'label': 'country'}, {'name_': 'P279', 'source': 5, 'target': 4, 'label': 'subclass of'}, {'name_': 'P27', 'source': 6, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P19', 'source': 6, 'target': 3, 'label': 'place of birth'}, {'name_': 'P172', 'source': 6, 'target': 5, 'label': 'ethnic or cultural origin'}, {'name_': 'P971', 'source': 7, 'target': 2, 'label': 'category combines topics'}, {'name_': 'P971', 'source': 7, 'target': 4, 'label': 'category combines topics'}]}