user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Which state is the United States Chief Economist and Economic Policy Adviser a senator of? 
Knowledge Triplets: Australian Senate, government.governmental_body.offices_positions, Australian Senator
m.09pvp05, government.government_position_held.basic_title, Senator
Delaware, location.location.containedby, United States of America
Delaware, government.political_district.representatives, m.04d6t3p
Contiguous United States, location.location.contains, Delaware
m.02_x9c6, government.government_position_held.basic_title, Senator
m.04d6f_9, government.government_position_held.district_represented, Delaware
m.0118dz2d, government.government_position_held.office_position_or_title, Senator
United States House of Representatives election in Delaware, 2008, government.election.winner, Michael Castle
m.04d79cd, government.government_position_held.district_represented, Delaware
m.04d7593, government.government_position_held.basic_title, Senator
m.04d7bqx, government.government_position_held.basic_title, Senator
m.0h74t52, award.ranking.item, Delaware State University
m.04d7rgg, government.government_position_held.basic_title, Senator
United States Senate special election in Delaware, 2010, government.election.district, Delaware
Delaware, government.political_district.representatives, m.04d5x7d
Senator of Chile, common.topic.notable_types, Government Office or Title
m.04d757t, government.government_position_held.office_position_or_title, United States Senator
m.09rfksg, government.government_position_held.office_position_or_title, United States Senator
m.04d5x7d, government.government_position_held.district_represented, Delaware
m.0kkqx6l, government.government_position_held.basic_title, Senator
m.04d7bqx, government.government_position_held.district_represented, Delaware
m.0kbjx6t, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0bfn2zg
m.04d7bqk, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.04d6n7n
Henry Latimer, government.politician.government_positions_held, m.09rfknq
Senator, common.topic.notable_types, Government Office or Title
Thomas McKean, government.politician.government_positions_held, m.09ryj97
Massachusetts Senator, government.government_office_or_title.governmental_body_if_any, Massachusetts Senate
Senate of Chile, government.governmental_body.jurisdiction, Chile
Delaware, government.political_district.representatives, m.09ryjlr
Delaware, government.political_district.representatives, m.09rfknq
m.0kkqx64, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kkqx7k
m.04d759t, government.government_position_held.office_position_or_title, United States Senator
m.04d78f1, government.government_position_held.office_position_or_title, United States Senator
m.04d5784, government.government_position_held.office_position_or_title, United States Senator
Richard R. Kenney, government.politician.government_positions_held, m.04d7bsk
m.04d7bs7, government.government_position_held.office_position_or_title, United States Senator
Australian Senator, common.topic.webpage, m.04zls9b
Delaware, location.location.contains, United States lightship WAL 539
Massachusetts Senate, government.governmental_body.jurisdiction, Massachusetts
m.04d7bsk, government.government_position_held.basic_title, Senator
m.04d7rhp, government.government_position_held.office_position_or_title, United States Senator
Australian Senator, common.topic.article, m.04xhmzk
m.04d4y9r, government.government_position_held.office_position_or_title, United States Senator
m.0ngkfdg, government.government_position_held.office_position_or_title, Senator of Chile
m.0kbjyxx, government.government_position_held.district_represented, Delaware
Massachusetts Senator, common.topic.notable_for, g.1258qrd2d
James A. Bayard, Jr., government.politician.government_positions_held, m.0kkqx7k
Senator of Chile, government.government_office_or_title.jurisdiction, Chile
Delaware, government.political_district.representatives, m.0kkqx80
Senator of Chile, government.government_office_or_title.governmental_body_if_any, Senate of Chile
Senate of Chile, government.governmental_body.offices_positions, Senator of Chile
m.07hvtsb, government.government_position_held.office_position_or_title, Massachusetts Senator
m.04d7bqk, government.government_position_held.district_represented, Delaware
m.09rfknq, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kkqx64
Delaware, government.political_district.representatives, m.04d5784
Delaware, government.political_district.representatives, m.04d759t
m.09rfknq, government.government_position_held.basic_title, Senator
m.04d6n7n, government.government_position_held.district_represented, Delaware
Massachusetts, government.governmental_jurisdiction.government_positions, Massachusetts Senator
m.09ryj97, government.government_position_held.district_represented, Delaware
m.09pvp05, government.government_position_held.office_position_or_title, United States Senator
m.0n8sfx9, government.government_position_held.governmental_body, Senate of Chile
m.0wq9_s6, government.government_position_held.jurisdiction_of_office, Massachusetts
m.04d5361, government.government_position_held.office_position_or_title, United States Senator
Delaware, location.us_state.capital, Dover
m.04d7tl6, government.government_position_held.basic_title, Senator
m.0wq9_s6, government.government_position_held.governmental_body, Massachusetts Senate
Australian Senator, common.topic.notable_types, Government Office or Title
m.04d7593, government.government_position_held.district_represented, Delaware
Australian Senator, government.government_office_or_title.category, Senator
m.0kkqx8d, government.government_position_held.district_represented, Delaware
m.03lpwmm, government.government_position_held.basic_title, Senator
United States lightship WAL 539, location.location.containedby, Delaware
m.0bfn2yt, government.government_position_held.office_position_or_title, United States Senator
Delaware, location.location.contains, Columbia
Senator of Chile, common.topic.notable_for, g.12586lzyt
Senator of Chile, government.government_office_or_title.category, Senator
Delaware, government.political_district.representatives, m.04d79cd
m.0kkqx9n, government.government_position_held.basic_title, Senator
Senator, government.government_position_held.basic_title, m.02_x98m
m.07hvtsb, government.government_position_held.governmental_body, Massachusetts Senate
Chile, government.governmental_jurisdiction.government_bodies, Senate of Chile
m.04d7rh8, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.05kch26
m.04d759g, government.government_position_held.district_represented, Delaware
m.0kkqx4l, government.government_position_held.office_position_or_title, United States Senator
m.0kbjyxx, government.government_position_held.office_position_or_title, United States Senator
m.0kkqx80, government.government_position_held.office_position_or_title, United States Senator
Massachusetts Senator, government.government_office_or_title.jurisdiction, Massachusetts
Senator, government.government_office_or_title.office_holders, m.0118dz2d
m.0bfn2zg, government.government_position_held.district_represented, Delaware
m.02_x98m, government.government_position_held.district_represented, Delaware
South Atlantic States, location.location.contains, Delaware
m.04d7593, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.04d7rgg
m.09s3h3d, government.government_position_held.office_position_or_title, Massachusetts Senator
Delaware, government.political_district.representatives, m.0kkqx5c
m.04d6f_9, government.government_position_held.office_position_or_title, United States Senator
Senator, common.topic.notable_for, g.1255vf17d
m.04d7brx, government.government_position_held.basic_title, Senator
m.09s3h3d, government.government_position_held.basic_title, Senator
United States House of Representatives election in Delaware, 2006, government.election.winner, Michael Castle
John J. Williams, government.politician.government_positions_held, m.04d5_58
m.04d5361, government.government_position_held.district_represented, Delaware
Nick Rast, fictional_universe.fictional_character.occupation, Australian Senator
m.0kkqx4_, government.government_position_held.district_represented, Delaware
United States Senate special election in Delaware, 2010, government.election.office, United States Senate
m.0mtldkf, government.government_position_held.basic_title, Senator
m.0bfn2yt, government.government_position_held.basic_title, Senator
m.02_x98m, government.government_position_held.district_represented, Delaware
m.0gm4pv_, government.government_position_held.district_represented, Delaware
J. Allen Frear, Jr., government.politician.government_positions_held, m.04d7bq7
Massachusetts Senator, government.government_office_or_title.office_holders, m.09s3h3d
Delaware, government.political_district.representatives, m.04d7rh8
m.0kkqx70, government.government_position_held.basic_title, Senator
Delaware, location.administrative_division.country, United States of America
m.04d6t3p, government.government_position_held.basic_title, Senator
m.04d6t3p, government.government_position_held.office_position_or_title, United States Senator
m.02_x98m, government.government_position_held.basic_title, Senator
Delaware, location.location.containedby, South Atlantic States
m.0bfn2sf, government.government_position_held.basic_title, Senator
m.04d7tl6, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.09ryjl_
m.0kkqx64, government.government_position_held.basic_title, Senator
m.04d7rfn, government.government_position_held.basic_title, Senator
Senator, government.government_office_category.offices, Australian Senator
m.09s3h3d, government.government_position_held.jurisdiction_of_office, Massachusetts
m.09rfksg, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.0kkqx6l
m.0ngkfdg, government.government_position_held.governmental_body, Senate of Chile
m.0kbjyy7, government.government_position_held.district_represented, Delaware
m.0bfn2vg, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kkqx8d
m.0118dz2d, government.government_position_held.office_holder, Willem Witteveen
Thomas F. Bayard, Jr., government.politician.government_positions_held, m.04d759g
m.0kkqx98, government.government_position_held.district_represented, Delaware
m.0kkqx5c, government.government_position_held.office_position_or_title, United States Senator
United States, with Territories, location.location.contains, Delaware
Delaware, government.political_district.representatives, m.04d7bs7
m.05kch26, government.government_position_held.office_position_or_title, United States Senator
m.09pv6s9, government.government_position_held.office_position_or_title, United States Senator
m.0bfn2vg, government.government_position_held.district_represented, Delaware
Martin W. Bates, government.politician.government_positions_held, m.04d7rfn
Australia, government.governmental_jurisdiction.government_bodies, Australian Senate
Delaware, government.political_district.representatives, m.04d5361
John M. Clayton, government.politician.government_positions_held, m.0bfn2yt
Chief Economist and Economic Policy Adviser, government.government_office_or_title.office_holders, m.0527kzw
Massachusetts Senate, government.governmental_body.members, m.09s3h58
m.09ryjlr, government.government_position_held.district_represented, Delaware
John M. Clayton, government.politician.government_positions_held, m.0bfn2zg
Australian Senator, fictional_universe.character_occupation.characters_with_this_occupation, Nick Rast
m.04d7bs7, government.government_position_held.basic_title, Senator
Senate of Chile, government.governmental_body.members, m.0n8sfx9
m.0kkqx9n, government.government_position_held.district_represented, Delaware
m.0kkqx8d, government.government_position_held.basic_title, Senator
m.0n8sfx9, government.government_position_held.basic_title, Senator
m.03lpwmm, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kkqx98
Delaware, government.political_district.representatives, m.09rfksg
Arnold Naudain, government.politician.government_positions_held, m.03l79d8
m.0m1d_55, government.government_position_held.district_represented, Delaware
m.03l79d8, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.04d759g
m.0wq9_s6, government.government_position_held.office_position_or_title, Massachusetts Senator
m.0kkqx8s, government.government_position_held.district_represented, Delaware
C. Douglass Buck, government.politician.government_positions_held, m.04d79cd
m.03l79d8, government.government_position_held.basic_title, Senator
Michael Castle, government.u_s_congressperson.thomas_id, C000243
Australian Senate, government.governmental_body.jurisdiction, Australia
Delaware, government.political_district.representatives, m.09pv6s9
m.04d757t, government.government_position_held.district_represented, Delaware
Delaware, location.location.contains, 19808
Delaware, government.political_district.representatives, m.0bfn2yt
Delaware, government.political_district.representatives, m.0bfn2vg
m.0527kzw, government.government_position_held.appointed_by, Joe Biden
Mid-Atlantic states, location.location.contains, Delaware
James A. Bayard, government.politician.government_positions_held, m.04d5784
m.04d78f1, government.government_position_held.basic_title, Senator
m.0m1hkc_, government.government_position_held.office_position_or_title, United States Senator
m.04d5784, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.0kkqx70
Delaware, government.political_district.representatives, m.0kbjx6t
Massachusetts Senator, government.government_office_or_title.office_holders, m.09s3h58
Massachusetts Senate, government.governmental_body.offices_positions, Massachusetts Senator
m.03lpwmm, government.government_position_held.district_represented, Delaware
m.0m1d_55, government.government_position_held.office_position_or_title, United States Senator
m.04d79cd, government.government_position_held.office_position_or_title, United States Senator
m.0527kzw, government.government_position_held.appointed_by, Joe Biden
m.04d7bqk, government.government_position_held.basic_title, Senator
m.04d7rfn, government.government_position_held.office_position_or_title, United States Senator
Michael Castle, user.robert.us_congress.us_representative.committee_memberships, United States House Committee on Financial Services
Delaware, government.political_district.representatives, m.04d7rhp
m.04d79cd, government.government_position_held.basic_title, Senator
m.04d759g, government.government_position_held.office_position_or_title, United States Senator
m.0ngkfdg, government.government_position_held.basic_title, Senator
m.0kkqx4l, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.04d4y9r
m.0kbjx6t, government.government_position_held.basic_title, Senator
m.04d759t, government.government_position_held.basic_title, Senator
m.04d7bs7, government.government_position_held.district_represented, Delaware
Chief Economist and Economic Policy Adviser, government.government_office_or_title.office_holders, m.0527kzw
Delaware, government.political_district.representatives, m.04d758c
m.09rfksg, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.04d5_58
m.0kbjyy7, government.government_position_held.office_position_or_title, United States Senator
m.09pv6s9, government.government_position_held.district_represented, Delaware
m.09pvp05, government.government_position_held.district_represented, Delaware
Delaware, location.location.containedby, United States, with Territories
m.04d758c, government.government_position_held.basic_title, Senator
Chief Economist and Economic Policy Adviser, common.topic.notable_for, g.1256chzlc
Delaware, government.political_district.representatives, m.0mtldkf
m.04d758c, government.government_position_held.district_represented, Delaware
m.0m1hkc_, government.government_position_held.basic_title, Senator
m.04d7rhp, government.government_position_held.basic_title, Senator
Massachusetts Senator, government.government_office_or_title.office_holders, m.0z9ywcb
m.04d757t, government.government_position_held.basic_title, Senator
m.09s3h3d, government.government_position_held.governmental_body, Massachusetts Senate
Senator of Chile, common.topic.article, m.0n8sg_s
m.0kkqx8s, government.government_position_held.basic_title, Senator
m.04d6n7n, government.government_position_held.office_position_or_title, United States Senator
Office of the Vice President of the United States, government.governmental_body.members, m.0527kzw
m.0527kzw, government.government_position_held.office_position_or_title, Chief Economist and Economic Policy Adviser
m.04d7brx, government.government_position_held.office_position_or_title, United States Senator
m.04d5x7d, government.government_position_held.basic_title, Senator
m.0kkqx6l, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.03l79d8
Delaware, government.political_district.representatives, m.04d7tl6
m.0gm4pv_, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.04d757t
m.04d6t3p, government.government_position_held.district_represented, Delaware
States General of the Netherlands, government.governmental_body.members, m.0118dz2d
m.05kch26, government.government_position_held.basic_title, Senator
Gov. William T. Watson Mansion, location.location.containedby, Delaware
Delaware, location.location.contains, Georgetown
m.0kkqx98, government.government_position_held.office_position_or_title, United States Senator
m.04d4y9r, government.government_position_held.basic_title, Senator
m.0kkqx4_, government.government_position_held.basic_title, Senator
Michael Castle, government.politician.party, m.05khv3g
m.0kkqx70, government.government_position_held.office_position_or_title, United States Senator
m.05kch26, government.government_position_held.district_represented, Delaware
Gov. William H. Ross House, location.location.containedby, Delaware
Senator of Chile, government.government_office_or_title.office_holders, m.0n8sfx9
Delaware, government.political_district.representatives, m.04d7bqk
m.04d7bq7, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.0kbjx74
Delaware, location.location.contains, Monterey
m.04d759g, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.0kbjyy7
m.0kbjyy7, government.government_position_held.basic_title, Senator
m.04d4y9r, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.04d7brx
Massachusetts Senator, government.government_office_or_title.office_holders, m.07hvtsb
Massachusetts Senate, government.governmental_body.members, m.09s3h3d
James M. Tunnell, government.politician.government_positions_held, m.04d759t
United States of America, location.country.administrative_divisions, Delaware
m.0kbjyxx, government.government_position_held.basic_title, Senator
m.0527kzw, government.government_position_held.governmental_body, Office of the Vice President of the United States
m.0bfn2vg, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.0kkqx8s
m.0527kzw, government.government_position_held.office_holder, Jared Bernstein
m.04d7bq7, government.government_position_held.district_represented, Delaware
m.04d6n7n, government.government_position_held.basic_title, Senator
m.04d5_58, government.government_position_held.basic_title, Senator
m.0z9ywcb, government.government_position_held.basic_title, Senator
m.0kkqx6l, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.03lpwmm
Australia, government.governmental_jurisdiction.government_positions, Australian Senator
Delaware, government.political_district.representatives, m.04d7593
m.0kbjx74, government.government_position_held.basic_title, Senator
m.0kkqx9n, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0bfn2sf
m.04d5361, government.government_position_held.basic_title, Senator
m.04d5784, government.government_position_held.basic_title, Senator
m.0bfn2zg, government.government_position_held.basic_title, Senator
Chief Economist and Economic Policy Adviser, common.topic.notable_types, Government Office or Title
m.02_x98m, government.government_position_held.office_position_or_title, United States Senator
Australian Senator, government.government_office_or_title.jurisdiction, Australia
m.0gm4pv_, government.government_position_held.office_position_or_title, United States Senator
m.03l79d8, government.government_position_held.office_position_or_title, United States Senator
m.0wq9_s6, government.government_position_held.basic_title, Senator
m.0kkqx98, government.government_position_held.basic_title, Senator
m.04d78f1, government.government_position_held.district_represented, Delaware
m.0kkqx80, government.government_position_held.basic_title, Senator
Australian Senator, government.government_office_or_title.governmental_body_if_any, Australian Senate
m.09s3h58, government.government_position_held.office_position_or_title, Massachusetts Senator
Delaware, government.political_district.representatives, m.0m1d_55
m.09ryjl_, government.government_position_held.district_represented, Delaware
Delaware, government.political_district.representatives, m.0kkqx9n
Delaware, government.political_district.representatives, m.04d7bsk
m.04d7rh8, government.government_position_held.office_position_or_title, United States Senator
m.09s3h58, government.government_position_held.governmental_body, Massachusetts Senate
m.0kkqx7k, government.government_position_held.district_represented, Delaware
m.0bfn2sf, government.government_position_held.office_position_or_title, United States Senator
m.0kkqx8s, government.government_position_held.office_position_or_title, United States Senator
m.0kbjx74, government.government_position_held.office_position_or_title, United States Senator
Delaware, location.location.contains, Wyoming
m.0mtldkf, government.government_position_held.office_position_or_title, United States Senator
m.04d7bq7, government.government_position_held.office_position_or_title, United States Senator
Massachusetts Senate, government.governmental_body.members, m.0wq9_s6
Senator, government.government_office_category.offices, Senator of Chile
m.0kkqx8d, government.government_position_held.office_position_or_title, United States Senator
Massachusetts Senator, government.government_office_or_title.category, Senator
m.0n8sfx9, government.government_position_held.office_position_or_title, Senator of Chile
m.04d758c, government.government_position_held.office_position_or_title, United States Senator
United States of America, location.location.contains, Delaware
Delaware, government.political_district.representatives, m.04d7rfn
m.04d7bqx, government.government_position_held.office_position_or_title, United States Senator
Delaware, location.location.contains, Gov. George Truitt House
John M. Clayton, government.politician.government_positions_held, m.03lpwmm
Massachusetts Senator, common.topic.notable_types, Government Office or Title
United States Senate election in Delaware, 2008, government.election.office, United States Senator
Delaware, location.location.containedby, Contiguous United States
Massachusetts Senate, government.governmental_body.members, m.0z9ywcb
m.04d5_58, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kbjyxx
Massachusetts Senator, government.government_office_or_title.office_holders, m.0wq9_s6
m.0kkqx4l, government.government_position_held.basic_title, Senator
m.0kkqx4_, government.government_position_held.office_position_or_title, United States Senator
Michael Castle, user.robert.us_congress.us_representative.state, Delaware
James A. Bayard, Jr., government.politician.government_positions_held, m.0kkqx5c
Senator, government.government_office_category.offices, Massachusetts Senator
m.04d5x7d, government.government_position_held.office_position_or_title, United States Senator
m.04d7rh8, government.government_position_held.basic_title, Senator
Delaware, location.location.contains, 19880
United States Senate election in Delaware, 2008, government.election.district, Delaware
m.0kkqx5c, government.government_position_held.basic_title, Senator
m.0kkqx7k, government.government_position_held.office_position_or_title, United States Senator
Newark, base.biblioness.bibs_location.state, Delaware
Massachusetts, government.governmental_jurisdiction.government_bodies, Massachusetts Senate
Australian Senator, common.topic.notable_for, g.1255x3q86
Senator of Chile, government.government_office_or_title.office_holders, m.0ngkfdg
m.04d7bsk, government.government_position_held.office_position_or_title, United States Senator
Delaware, government.political_district.representatives, m.0kkqx4l
m.0z9ywcb, government.government_position_held.governmental_body, Massachusetts Senate
m.0z9ywcb, government.government_position_held.jurisdiction_of_office, Massachusetts
m.02_x9c6, government.government_position_held.office_position_or_title, United States Senator
m.0bfn2zg, government.government_position_held.office_position_or_title, United States Senator
m.09pv6s9, government.government_position_held.basic_title, Senator
Delaware, government.political_district.representatives, m.09ryj97
m.0kkqx7k, government.government_position_held.basic_title, Senator
Senate of Chile, government.governmental_body.members, m.0ngkfdg
m.0z9ywcb, government.government_position_held.office_position_or_title, Massachusetts Senator
m.04d759t, government.government_position_held.district_represented, Delaware
m.0m1d_55, government.government_position_held.basic_title, Senator
Chile, government.governmental_jurisdiction.government_positions, Senator of Chile
Joe Biden, government.politician.government_positions_held, m.02_x98m
m.02_x9c6, government.government_position_held.district_represented, Delaware
m.04zls9b, common.webpage.topic, Australian Senator
United States Senate election in Delaware, 2008, government.election.winner, Joe Biden
m.04d6f_9, government.government_position_held.basic_title, Senator
Massachusetts Senate, government.governmental_body.members, m.07hvtsb
m.04d7rgg, government.government_position_held.office_position_or_title, United States Senator
m.0kkqx5c, government.government_position_held.district_represented, Delaware

Answer: Delaware