How many Latino senators has there been in the history of the US?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q824', 'id': 1, 'label': 'Oregon'}, {'type': 'INTERNAL', 'name_': 'Q1211934', 'id': 2, 'label': 'Hispanic'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1464994', 'id': 3, 'label': 'Latino'}, {'type': 'INTERNAL', 'name_': 'Q2086261', 'id': 4, 'label': 'Phil Jimenez'}, {'type': 'INTERNAL', 'name_': 'Q114959874', 'id': 5, 'label': 'Efraín M. Díaz-Horna'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P150', 'source': 0, 'target': 1, 'label': 'contains the administrative territorial entity'}, {'name_': 'P1382', 'source': 2, 'target': 3, 'label': 'partially coincident with'}, {'name_': 'P27', 'source': 4, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P172', 'source': 4, 'target': 3, 'label': 'ethnic or cultural origin'}, {'name_': 'P27', 'source': 5, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P108', 'source': 5, 'target': 1, 'label': 'employer'}, {'name_': 'P172', 'source': 5, 'target': 2, 'label': 'ethnic or cultural origin'}]}