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: Who is the 107th United States Congressional Senator? 
Knowledge Triplets: 21st United States Congress, government.legislative_session.members, m.0bfmhwp
United States Senate elections, 2006, time.event.locations, Nevada
United States Senate Committee on Commerce, Science, and Transportation, common.topic.article, m.02y0sr
United States Senate elections, 2006, time.event.locations, Delaware
32nd United States Congress, government.legislative_session.legislature, United States Congress
United States Senate Page, government.government_office_or_title.governmental_body_if_any, United States Senate
United States Senate, government.governmental_body.jurisdiction, United States of America
m.0422l7l, common.webpage.topic, United States Senate
m.04dhh24, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, business.employer.employees, m.046w5m0
34th United States Congress, common.topic.notable_types, Legislative session
United States Senate Committee on the Judiciary, government.legislative_committee.members, m.02_wk3n
United States Senate, business.employer.employees, m.0514c9v
United States Senate, business.employer.employees, m.04flg3q
United States Senate, visual_art.art_owner.artworks_owned, m.09rykyc
United States Senate, business.employer.employees, m.04hzty7
United States Senate, business.employer.employees, m.052lw71
Secretary of the United States Senate, common.topic.article, m.03by0n
United States Senate Committee on Foreign Relations, government.legislative_committee.members, m.03h9hnh
United States Senate majority leader, government.government_office_or_title.office_holders, m.05k9hxg
United States Senate Committee on the Judiciary, common.topic.article, m.036ww_
Assistant Minority Leader of the United States Senate, common.topic.notable_types, Government Office or Title
United States Senate Committee on Armed Services, government.legislative_committee.members, m.030qn9x
30th United States Congress, government.legislative_session.members, m.0bfmkh1
United States Senate election in Ohio, 2010, government.election.office, United States Senator
United States Senate, government.governmental_body.offices_positions, United States Senate minority leader
m.02_ws9_, government.legislative_committee_membership.session, 110th United States Congress
11th United States Congress, government.legislative_session.members, m.0bfmkdj
32nd United States Congress, common.topic.notable_types, Legislative session
United States Senate elections, 2006, time.event.locations, Tennessee
United States Senate, business.employer.employees, m.0g69h84
m.05kg_6s, government.government_position_held.legislative_sessions, 113th United States Congress
United States Senate Committee on Rules and Administration, government.legislative_committee.legislature, United States Senate
United States Congress, common.topic.notable_for, g.125989tts
United States Senate Committee on Armed Services, common.topic.image, United States Senate Committee on Armed Services, Levin D-MI & Warner R-VA, 7-31-2007
United States Senate elections, 2006, time.event.locations, Connecticut
United States Senator, base.descriptive_names.names.descriptive_name, m.0100zlls
m.05kfccr, government.government_position_held.legislative_sessions, 111th United States Congress
m.04dhh59, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, business.employer.employees, m.04flgfv
United States Senate elections, 2006, time.event.locations, Wyoming
United States Senate, book.author.works_written, Telephone directory, United States Senate, 1976
Ohio, base.biblioness.bibs_location.state, Cincinnati
President pro tempore of the United States Senate, common.topic.webpage, m.0chcy29
Telephone directory, United States Senate, 1976, common.topic.notable_for, g.1257j4jjg
United States Senate elections, 2006, time.event.locations, Hawaii
m.04dhh4q, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, business.employer.employees, m.04kbcz_
United States Senate elections, 2006, time.event.locations, Michigan
United States Senate, business.employer.employees, m.04flfw4
President pro tempore of the United States Senate, government.government_office_or_title.office_holders, m.0nbz0_p
United States Senate Committee on Armed Services, government.legislative_committee.members, m.07l163g
m.05kg_6s, government.government_position_held.legislative_sessions, 112th United States Congress
President pro tempore of the United States Senate, government.government_office_or_title.office_holders, m.0nbz2xd
28th United States Congress, government.legislative_session.members, m.0bfmhvr
m.030qnc3, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, visual_art.art_owner.artworks_owned, m.09ryl3h
United States Senate Committee on the Judiciary, government.legislative_committee.legislature, United States Senate
United States Senate, business.employer.employees, m.06ybx76
United States Senate, visual_art.art_owner.artworks_owned, m.0bfp2_t
m.09vkhqw, common.webpage.topic, President pro tempore of the United States Senate
m.0gm5f32, government.government_position_held.legislative_sessions, 113th United States Congress
34th United States Congress, government.legislative_session.members, m.0bfmkkv
m.05kfccr, government.government_position_held.jurisdiction_of_office, United States of America
United States Senate, government.government_position_held.governmental_body, m.0gm5f32
28th United States Congress, common.topic.notable_types, Legislative session
108th United States Congress, government.legislative_session.legislature, United States Congress
m.05kg_6s, government.government_position_held.legislative_sessions, 110th United States Congress
United States Senator, fictional_universe.character_occupation.characters_with_this_occupation, Nathan Petrelli
10th United States Congress, government.legislative_session.members, m.0bfmkd6
United States Senate, base.symbols.symbol_user.symbols, m.063vjb7
United States Senate, business.employer.employees, m.04c_jcw
United States Congress, government.governmental_body.component_bodies, United States Senate
12th United States Congress, government.legislative_session.members, m.0bfmkdv
United States Senate Page, common.topic.notable_for, g.125g6_9j_
United States Senate, business.employer.employees, m.06ybx7l
11th United States Congress, government.legislative_session.members, m.0bfmkdv
United States Senate elections, 2006, time.event.locations, Mississippi
United States Senate, business.employer.employees, m.04hzyg9
United States Congress, government.governmental_body.offices_positions, President pro tempore of the United States Senate
112th United States Congress, government.legislative_session.legislature, United States Congress
United States Senate Committee on the Judiciary, business.employer.employees, m.010131jp
109th United States Congress, common.topic.notable_types, Legislative session
111th United States Congress, common.topic.notable_types, Legislative session
United States Senator, fictional_universe.character_occupation.characters_with_this_occupation, Senator Ross Garrison
President pro tempore of the United States Senate, government.government_office_or_title.governmental_body_if_any, United States Senate
United States Senate, base.ontologies.ontology_instance.equivalent_instances, m.07nfzf9
110th United States Congress, common.topic.notable_types, Legislative session
United States Senate, common.topic.notable_types, Governmental Body
Assistant Minority Leader of the United States Senate, common.topic.notable_for, g.125f9cfv0
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.members, m.02_ws8n
President pro tempore of the United States Senate, government.government_office_or_title.office_holders, m.09rfdwh
34th United States Congress, government.legislative_session.legislature, United States Congress
m.04dhh3l, government.legislative_committee_membership.session, 110th United States Congress
President pro tempore of the United States Senate, common.topic.notable_for, g.125h3jrnr
17th United States Congress, government.legislative_session.members, m.0bfmkfg
United States Senate elections, 2006, time.event.locations, North Dakota
23rd United States Congress, government.legislative_session.members, m.0bfmhwc
United States Senate majority leader, government.government_office_or_title.office_holders, m.052jk8v
m.0gm5f32, government.government_position_held.office_holder, Rob Portman
United States Senator, base.descriptive_names.names.descriptive_name, m.01011vbp
United States Senate, business.employer.employees, m.04c_jdh
United States Senate Committee on Armed Services, government.legislative_committee.legislature, United States Senate
20th United States Congress, government.legislative_session.members, m.0bfmhwp
m.0chcy29, common.webpage.topic, President pro tempore of the United States Senate
United States Senate Committee on Commerce, Science, and Transportation, common.topic.notable_for, g.125brlx5j
m.04dhh3v, government.legislative_committee_membership.session, 110th United States Congress
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v2m
106th United States Congress, government.legislative_session.legislature, United States Congress
107th United States Congress, common.topic.notable_types, Legislative session
United States Senate Committee on Foreign Relations, common.topic.notable_for, g.1257s26y1
Telephone directory, United States Senate, 1976, common.topic.notable_types, Book
United States Senate minority leader, government.government_office_or_title.office_holders, m.052jk8m
United States Senate, common.topic.image, 600px-Senate_Seal.svg.png
29th United States Congress, government.legislative_session.members, m.0bfmkh1
United States Senate elections, 2006, time.event.locations, Virginia
10th United States Congress, government.legislative_session.members, m.0bfmhz9
9th United States Congress, government.legislative_session.members, m.0bfmhzn
United States Senate, common.topic.webpage, m.03ldgbc
United States Senate Page, common.topic.image, Vice Pres
m.05nlpmx, government.government_position_held.legislative_sessions, 109th United States Congress
Assistant Majority Leader of the United States Senate, common.topic.notable_for, g.1258r1fl3
United States Congress, government.governmental_body.jurisdiction, United States of America
107th Congress-Senate Map, common.image.size, m.029vfd8
United States Senate minority leader, common.topic.notable_types, Government Office or Title
United States Senate, business.employer.employees, m.05cvl12
Cincinnati, people.person.place_of_birth, Rob Portman
United States Senate elections, 2006, time.event.locations, Minnesota
United States Senate, visual_art.art_owner.artworks_owned, m.09ryl3c
United States Senate, business.employer.employees, m.0514c9h
m.05kfccr, government.government_position_held.legislative_sessions, 110th United States Congress
Daschle letter, common.image.appears_in_topic_gallery, 107th United States Congress
m.02_x991, government.legislative_committee_membership.session, 110th United States Congress
United States Senate Democratic Whip, common.topic.article, m.03ghxr
United States Senate, business.employer.employees, m.05f1dgk
United States Senate Committee on Foreign Relations, government.legislative_committee.members, m.04dhh1x
United States Senate elections, 2006, time.event.locations, Arizona
United States Senate, common.topic.article, m.07t5l
President pro tempore of the United States Senate, common.topic.image, Ppt-seal
United States Senate elections, 2006, time.event.locations, Pennsylvania
United States Senate minority leader, government.government_office_or_title.office_holders, m.05k9jtj
President pro tempore of the United States Senate, common.topic.notable_types, Government Office or Title
m.02_wy7h, government.legislative_committee_membership.session, 110th United States Congress
United States Senate Committee on Foreign Relations, common.topic.image, Bob Casey, Jr
United States Senate, government.governmental_body.offices_positions, United States Senator
United States Senate, visual_art.art_owner.artworks_owned, m.09ryl37
United States Senate, book.book_subject.works, Profiles in Courage
United States Senate, book.author.works_written, United States Senate graphic arts collection
m.04dhh4g, government.legislative_committee_membership.session, 110th United States Congress
17th United States Congress, common.topic.notable_types, Legislative session
m.04dhh1x, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, book.author.works_written, The journal of the Senate, including the Journal of the Executive proceedings of the Senate
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v98
United States Senate minority leader, government.government_office_or_title.governmental_body_if_any, United States Senate
Nathan Petrelli, fictional_universe.fictional_character.occupation, United States Senator
Assistant Minority Leader of the United States Senate, government.government_office_or_title.governmental_body_if_any, United States Senate
113th United States Congress, common.topic.notable_types, Legislative session
United States Senate, business.employer.employees, m.04flfwk
United States Senate, book.author.works_written, Tributes to Senator Marlow W. Cook
107th United States Congress, common.topic.image, President George W. Bush addressing a joint session of Congress, regarding the September 11th War on Terrorism
108th United States Congress, common.topic.notable_types, Legislative session
United States Senate majority leader, common.topic.notable_for, g.1259mwpd3
m.05kfccr, government.government_position_held.legislative_sessions, 107th United States Congress
23rd United States Congress, government.legislative_session.members, m.0bfmkgq
m.03h9hnx, government.legislative_committee_membership.session, 110th United States Congress
Assistant Majority Leader of the United States Senate, common.topic.notable_types, Government Office or Title
United States Senate, government.governmental_body.offices_positions, United States Senate majority leader
United States Senate elections, 2006, time.event.locations, Rhode Island
United States Senate election in Ohio, 2010, common.topic.article, m.05233bx
United States Senate, business.employer.employees, m.05nmypf
President pro tempore of the United States Senate, government.government_office_or_title.governmental_body_if_any, United States Congress
600px-Senate_Seal.svg.png, common.image.appears_in_topic_gallery, United States Senate
United States Senate, government.governmental_body.offices_positions, United States Senate Democratic Whip
United States Senate elections, 2006, time.event.locations, Vermont
United States Senate elections, 2006, time.event.locations, Washington
United States Senate elections, 2006, time.event.locations, Montana
107th United States Congress, common.topic.notable_for, g.1256vs30p
United States Senate Committee on the Judiciary, government.legislative_committee.members, m.02_x99b
m.03ldgbc, common.webpage.topic, United States Senate
United States Senate, business.employer.employees, m.05fz_hg
m.04dhh2n, government.legislative_committee_membership.session, 110th United States Congress
United States Senate Committee on the Judiciary, common.topic.image, Sonia Sotomayor on first day of confirmation hearings
United States Senate elections, 2006, time.event.locations, California
United States Senate, government.governmental_body.jurisdiction, United States of America
United States Senator, fictional_universe.character_occupation.characters_with_this_occupation, John \"Bluto\" Blutarsky
President pro tempore of the United States Senate, common.topic.article, m.0d5jj
United States Senate Page, common.topic.article, m.07_5xn
United States Senate Committee on the Judiciary, government.legislative_committee.members, m.05lmm6l
United States Senate graphic arts collection, book.written_work.author, United States Senate
107th United States Congress, government.government_position_held.legislative_sessions, m.05kfccr
United States Senate, common.topic.webpage, m.0422l7l
Secretary of the United States Senate, common.topic.notable_for, g.125g4ph_v
United States Senate, business.employer.employees, m.012d_blh
United States Senate majority leader, government.government_office_or_title.office_holders, m.0k1bgw_
106th United States Congress, common.topic.notable_types, Legislative session
m.04dhh5k, government.legislative_committee_membership.session, 110th United States Congress
107th United States Congress, government.legislative_session.legislature, United States Congress
United States Senate Committee on the Judiciary, government.legislative_committee.members, m.02_wsl5
Tributes to Senator Marlow W. Cook, book.written_work.author, United States Senate
m.030qq6_, government.legislative_committee_membership.session, 110th United States Congress
United States Senate Committee on the Judiciary, common.topic.notable_for, g.125dr6fd0
United States Senate elections, 2006, time.event.locations, Wisconsin
m.02_wjxz, government.legislative_committee_membership.session, 110th United States Congress
President George W. Bush addressing a joint session of Congress, regarding the September 11th War on Terrorism, common.image.appears_in_topic_gallery, 107th United States Congress
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v5t
United States Senate Page, common.topic.notable_types, Government Office or Title
17th United States Congress, government.legislative_session.members, m.0bfmkfs
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.members, m.030qnb3
Senator Ross Garrison, fictional_universe.fictional_character.occupation, United States Senator
United States Senate minority leader, government.government_office_or_title.office_holders, m.052jk2b
United States Senate, book.author.works_written, Renovated butter
33rd United States Congress, government.legislative_session.members, m.0bfmhtt
United States Senate Committee on Foreign Relations, government.legislative_committee.members, m.03h9hnx
United States Senate, business.employer.employees, m.07sgqlf
33rd United States Congress, common.topic.notable_types, Legislative session
United States Senate, business.employer.employees, m.05g5t9z
United States Senate elections, 2006, time.event.locations, West Virginia
Ohio, location.country.first_level_divisions, United States of America
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.legislature, United States Senate
President pro tempore of the United States Senate, government.government_office_or_title.office_holders, m.05nlpmx
m.05k9hxg, government.government_position_held.legislative_sessions, 110th United States Congress
Ohio, government.political_district.representatives, m.0gm5f32
107th United States Congress, common.topic.image, 107th Congress-Senate Map
United States Senate, business.employer.employees, m.04fzfcy
United States Senator, common.topic.image, 600px-Senate_Seal.svg.png
United States Senate, business.employer.employees, m.05ft8r7
32nd United States Congress, government.legislative_session.members, m.0bfmkhc
United States Senate Committee on Foreign Relations, government.legislative_committee.members, m.04dhh5k
United States Senator, base.descriptive_names.names.descriptive_name, m.01011vcr
20th United States Congress, government.legislative_session.members, m.0bfmkg2
United States Senate elections, 2006, time.event.locations, Florida
m.04dhh42, government.legislative_committee_membership.session, 110th United States Congress
United States Senate Committee on the Judiciary, government.legislative_committee.members, m.02_wjw6
United States Senate, business.employer.employees, m.07sgqm6
United States Senate graphic arts collection, common.topic.notable_for, g.1258jtfbn
14th United States Congress, government.legislative_session.members, m.0bfmhwp
United States Senate, government.governmental_body.offices_positions, Secretary of the United States Senate
107th United States Congress, common.topic.image, Daschle letter
33rd United States Congress, government.legislative_session.members, m.0bfmkhc
United States Senate majority leader, government.government_office_or_title.office_holders, m.052jk8c
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.members, m.02_x9d3
United States Senate Democratic Whip, common.topic.notable_for, g.1257w3yrx
34th United States Congress, government.legislative_session.members, m.0bfmhtt
United States Senator, common.topic.notable_types, Government Office or Title
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v3g
President pro tempore of the United States Senate, base.schemastaging.context_name.pronunciation, g.125_m9mcg
United States Senate, visual_art.art_owner.artworks_owned, m.051s2bv
m.04dhh2_, government.legislative_committee_membership.session, 110th United States Congress
m.05kfccr, government.government_position_held.legislative_sessions, 106th United States Congress
United States Senate Committee on Armed Services, government.legislative_committee.members, m.030qmtg
112th United States Congress, common.topic.notable_types, Legislative session
President pro tempore of the United States Senate, government.government_office_or_title.office_holders, m.04mmcc8
President pro tempore of the United States Senate, common.topic.image, Robert Byrd official portrait
Secretary of the United States Senate, common.topic.notable_types, Government Office or Title
United States Senate, business.employer.employees, m.04kq01t
United States Senate, film.film_subject.films, Advise & Consent
United States Senate, business.employer.employees, m.04c_jd2
United States Senator, government.government_office_or_title.governmental_body_if_any, United States Senate
United States Senate elections, 2006, time.event.locations, Maine
m.04dhh37, government.legislative_committee_membership.session, 110th United States Congress
United States Senate, business.employer.employees, m.04fzffc
107th United States Congress, government.legislative_session.legislature, United States Congress
17th United States Congress, government.legislative_session.members, m.0bfmhwp
32nd United States Congress, government.legislative_session.members, m.0bfmhtt
United States Senator, government.government_office_or_title.governmental_body_if_any, United States Congress
107th Congress-Senate Map, common.image.appears_in_topic_gallery, 107th United States Congress
12th United States Congress, government.legislative_session.members, m.0bfmhxv
United States Senate, government.governmental_body.offices_positions, President pro tempore of the United States Senate
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.members, m.05nls2f
United States Senate, business.employer.employees, m.0514c93
United States Senate elections, 2006, time.event.locations, New Jersey
United States of America, government.governmental_jurisdiction.government_positions, United States Senator
United States Senate elections, 2006, time.event.locations, Utah
m.04dhh2d, government.legislative_committee_membership.session, 110th United States Congress
m.05kfccr, government.government_position_held.legislative_sessions, 108th United States Congress
United States Senate elections, 2006, time.event.locations, Massachusetts
United States Senate, business.employer.employees, m.0j2db1s
m.03h9hnh, government.legislative_committee_membership.session, 110th United States Congress
United States Senate election in Ohio, 2010, common.topic.image, Rob Portman official photo
United States Senate, business.employer.employees, m.052lw6q
United States Senator, government.government_office_or_title.jurisdiction, United States of America
United States Senate majority leader, common.topic.notable_types, Government Office or Title
United States Senate Committee on the Judiciary, business.employer.employees, m.04zjkjf
m.05nlpmx, government.government_position_held.legislative_sessions, 108th United States Congress
United States Senate minority leader, common.topic.notable_for, g.125bpghx2
11th United States Congress, government.legislative_session.members, m.0bfmhxv
United States Senate, government.governmental_body.offices_positions, United States Senate Page
20th United States Congress, government.legislative_session.members, m.0bfmkgd
United States Senate elections, 2006, time.event.locations, Indiana
President pro tempore of the United States Senate, common.topic.image, Byrd of2
United States Senate, government.governmental_body.offices_positions, Assistant Majority Leader of the United States Senate
111th United States Congress, government.legislative_session.legislature, United States Congress
United States Senate, business.employer.employees, m.05fvfz1
United States Senate Committee on Armed Services, common.topic.notable_for, g.125h43b3x
United States Senate elections, 2006, time.event.locations, Nebraska
United States Senate elections, 2006, time.event.locations, Ohio
21st United States Congress, government.legislative_session.members, m.0bfmkgd
11th United States Congress, government.legislative_session.members, m.0bfmhy4
m.05kfccr, government.government_position_held.legislative_sessions, 109th United States Congress
United States Senate elections, 2006, time.event.locations, Maryland
109th United States Congress, government.legislative_session.legislature, United States Congress
United States Senate elections, 2006, time.event.locations, Texas
33rd United States Congress, government.legislative_session.members, m.0nbz0_p
United States Senate Committee on Commerce, Science, and Transportation, government.legislative_committee.members, m.030r1gh
United States Senate, common.topic.notable_for, g.1259v06zd
9th United States Congress, government.legislative_session.members, m.0bfmhz9
United States Senate, government.governmental_body.body_this_is_a_component_of, United States Congress
m.0gm5f32, government.government_position_held.legislative_sessions, 112th United States Congress
United States Senate, base.schemastaging.context_name.pronunciation, g.125_mp915
United States Senator, common.topic.notable_for, g.1259lv35m
United States Senate elections, 2006, time.event.locations, New York
United States Senate, government.governmental_body.offices_positions, Assistant Minority Leader of the United States Senate
107th United States Congress, common.topic.article, m.024tkk
Telephone directory, United States Senate, 1976, book.written_work.author, United States Senate
United States Senate election in Ohio, 2010, common.topic.notable_for, g.125fpx87t
Assistant Majority Leader of the United States Senate, government.government_office_or_title.governmental_body_if_any, United States Senate
United States Senate, business.employer.employees, m.0514cb6
600px-Senate_Seal.svg.png, common.image.appears_in_topic_gallery, United States Senator
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v4m
United States Senate, business.employer.employees, m.04gcg7z
President pro tempore of the United States Senate, common.topic.webpage, m.0czxqzq
President pro tempore of the United States Senate, common.topic.webpage, m.09vkhqw
28th United States Congress, government.legislative_session.members, m.0bfmkh1
United States Senator, base.descriptive_names.names.descriptive_name, m.01011v8s
United States Senate Committee on Foreign Relations, government.legislative_committee.members, m.04dhh2n
United States Senate elections, 2006, time.event.locations, New Mexico
m.0czxqzq, common.webpage.topic, President pro tempore of the United States Senate
United States Senate majority leader, government.government_office_or_title.governmental_body_if_any, United States Senate
United States Congress, government.governmental_body.offices_positions, United States Senator
33rd United States Congress, government.legislative_session.legislature, United States Congress
10th United States Congress, government.legislative_session.members, m.0bfmhy4
13th United States Congress, government.legislative_session.members, m.0bfmkf4
United States of America, people.person.nationality, Rob Portman
United States Senate majority leader, government.government_office_or_title.office_holders, m.094t_m4
m.05kg_6s, government.government_position_held.legislative_sessions, 111th United States Congress
110th United States Congress, government.legislative_session.legislature, United States Congress

Answer: Rob Portman