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': 'INTERNAL', 'name_': 'Q40348', 'id': 1, 'label': 'lawyer'}, {'type': 'INTERNAL', 'name_': 'Q60', 'id': 2, 'label': 'New York City'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q2041543', 'id': 3, 'label': 'Ottův slovník naučný'}, {'type': 'INTERNAL', 'name_': 'Q29536', 'id': 4, 'label': 'paganism'}, {'type': 'INTERNAL', 'name_': 'Q16799549', 'id': 5, 'label': 'Latin Americans'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1464994', 'id': 6, 'label': 'Latino'}, {'type': 'INTERNAL', 'name_': 'Q115575597', 'id': 7, 'label': 'Alejandra Caraballo'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P36', 'source': 0, 'target': 2, 'label': 'capital'}, {'name_': 'P1343', 'source': 1, 'target': 3, 'label': 'described by source'}, {'name_': 'P17', 'source': 2, 'target': 0, 'label': 'country'}, {'name_': 'P1343', 'source': 2, 'target': 3, 'label': 'described by source'}, {'name_': 'P1343', 'source': 4, 'target': 3, 'label': 'described by source'}, {'name_': 'P140', 'source': 5, 'target': 4, 'label': 'religion or worldview'}, {'name_': 'P1382', 'source': 5, 'target': 6, 'label': 'partially coincident with'}, {'name_': 'P27', 'source': 7, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P106', 'source': 7, 'target': 1, 'label': 'occupation'}, {'name_': 'P172', 'source': 7, 'target': 6, 'label': 'ethnic or cultural origin'}]}