Former representative · Colorado's 4th district

Ken Buck

Ken Buck served in Congress from 2015 to 2024, last as a Republican representative for Colorado's 4th district. In the 118th Congress, 814 roll calls were held while they served; they missed 56, and cast 479 of 543 party-unity votes with the majority of their caucus.

Party: Republican
Chamber: House; Former
In Congress since: Jan 6, 2015
Last term ended: Mar 22, 2024

Open in the Congress explorer Official record

Photo: Government Publishing Office (public domain)

Record by Congress

Counts with their denominators for each Congress and chamber served. Ranks are among members who served most of that Congress (100 or more roll calls): rank 1 did it most often. A description, not a grade.

Congress	Roll calls	Missed	Votes with party	Sponsored	Cosponsored across the aisle
118th CongressHouse of Representatives	814	6.9%56 of 814 · rank 53 of 442	88%479 of 543 · rank 384 of 442	170 became law	15%15 of 102
117th CongressHouse of Representatives	997	5.5%55 of 997 · rank 30 of 443	97%526 of 545 · rank 305 of 443	250 became law	22%55 of 251

Ideology (DW-NOMINATE)

Voteview's DW-NOMINATE first dimension estimates where members sit from all their roll calls: liberal (−1) to conservative (+1). It describes voting patterns, not views. Shown for the 118th Congress (House), with each party's median and the chamber's range.

Liberal −1+0.66+1 Conservative

Source: Lewis, Jeffrey B., Keith Poole, Howard Rosenthal, Adam Boche, Aaron Rudkin, and Luke Sonnet (2026). Voteview: Congressional Roll-Call Votes Database. https://voteview.com/

Votes against their party

The latest party-unity votes on bills and amendments where the member voted yea or nay against most of their caucus.

H.Res. 863: Impeaching Alejandro Nicholas Mayorkas, Secretary of Homeland Security, for high crimes and misdemeanors.Nay
Feb 13, 2024· House· Passage· On Agreeing to the Resolution, as Amended· Passed 214–213· Against party
H.Res. 863: Impeaching Alejandro Nicholas Mayorkas, Secretary of Homeland Security, for high crimes and misdemeanors.Nay
Feb 6, 2024· House· Passage· On Agreeing to the Resolution, as Amended· Failed 214–216· Against party
H.Res. 878: Providing for the expulsion of Representative George Santos from the United States House of Representatives.Yea
Dec 1, 2023· House· Passage· On Agreeing to the Resolution· Passed 311–114· Against party
H.R. 5894: Making appropriations for the Departments of Labor, Health and Human Services, and Education, and related agencies for the fiscal year ending September 30, 2024, and for other purposes.Nay
Nov 15, 2023· House· Amendments· On Agreeing to the Amendment· Failed 155–270· Against party
H.R. 5894: Making appropriations for the Departments of Labor, Health and Human Services, and Education, and related agencies for the fiscal year ending September 30, 2024, and for other purposes.Nay
Nov 15, 2023· House· Amendments· On Agreeing to the Amendment· Failed 157–268· Against party
H.R. 5894: Making appropriations for the Departments of Labor, Health and Human Services, and Education, and related agencies for the fiscal year ending September 30, 2024, and for other purposes.Nay
Nov 15, 2023· House· Amendments· On Agreeing to the Amendment· Failed 162–262· Against party
H.R. 5894: Making appropriations for the Departments of Labor, Health and Human Services, and Education, and related agencies for the fiscal year ending September 30, 2024, and for other purposes.Nay
Nov 15, 2023· House· Amendments· On Agreeing to the Amendment· Failed 144–279· Against party
H.R. 5894: Making appropriations for the Departments of Labor, Health and Human Services, and Education, and related agencies for the fiscal year ending September 30, 2024, and for other purposes.Nay
Nov 15, 2023· House· Amendments· On Agreeing to the Amendment· Failed 148–280· Against party

Recent votes

The latest roll calls on bills and amendments, with the member's recorded position.

H.R. 1023: Cutting Green Corruption and Taxes ActNot voting
Mar 22, 2024· House· Passage· On Passage· Passed 209–204
H.Res. 1102: Providing for the concurrence by the House in the Senate amendment to H.R. 2882, with an amendment.Nay
Mar 22, 2024· House· Passage· On Motion to Suspend the Rules and Agree· Passed 286–134
H.R. 7023: Creating Confidence in Clean Water Permitting ActYea
Mar 21, 2024· House· Passage· On Passage· Passed 213–205
H.R. 7023: Creating Confidence in Clean Water Permitting ActYea
Mar 21, 2024· House· Amendments· On Agreeing to the Amendment· Failed 99–323· Against party
H.R. 1836: Ocean Shipping Reform Implementation Act of 2023Yea
Mar 21, 2024· House· Passage· On Motion to Suspend the Rules and Pass, as Amended· Passed 393–24
H.Con.Res. 86: Expressing the sense of Congress that a carbon tax would be detrimental to the United States economy.Yea
Mar 21, 2024· House· Passage· On Agreeing to the Resolution· Passed 222–196
H.Res. 987: Denouncing the harmful, anti-American energy policies of the Biden administration, and for other purposes.Yea
Mar 21, 2024· House· Passage· On Agreeing to the Resolution· Passed 217–200
H.R. 6009: Restoring American Energy Dominance ActYea
Mar 20, 2024· House· Passage· On Passage· Passed 216–200
H.R. 1121: Protecting American Energy Production ActYea
Mar 20, 2024· House· Passage· On Passage· Passed 229–188
H.R. 7520: Protecting Americans’ Data from Foreign Adversaries Act of 2024Yea
Mar 20, 2024· House· Passage· On Motion to Suspend the Rules and Pass, as Amended· Passed 414–0
H.Res. 149: Condemning the illegal abduction and forcible transfer of children from Ukraine to the Russian Federation.Not voting
Mar 19, 2024· House· Passage· On Motion to Suspend the Rules and Agree, as Amended· Passed 390–9
H.R. 4723: Upholding the Dayton Peace Agreement Through Sanctions ActYea
Mar 19, 2024· House· Passage· On Motion to Suspend the Rules and Pass, as Amended· Passed 365–30

Committees

Seats as published by the congress-legislators project. Past seats are those no longer listed since Analisa began recording them.

No committee seats are listed.

Federal contracts in the district

Contract obligations attributed to Colorado's 4th district by each action's county and its award's ZIP code (land shares through census tracts); an estimate where ZIP codes cross district lines. Shown next to the member's record: neither explains the other.

Obligations · FY2026: $2.4B
Per resident: $3,150
Rank in Colorado: 2 of 8
Contract actions: 3,317; New awards: 1,797

By fiscal year

588.7MFY2017
529.3MFY2018
899.6MFY2019
829.4MFY2020
2.2BFY2021
3BFY2022
3BFY2023
2.2BFY2024
3.2BFY2025
2.4BFY2026

Top buyers

Department of the Air Force$1.1B48%
Department of Defense
Department of the Navy$735.9M31%
Department of Defense
National Aeronautics and Space Administration$400.6M17%
Department of Veterans Affairs$18.6M0.8%
Departmental Offices$16.6M0.7%
Department of the Interior
U.S. Immigration and Customs Enforcement$13.5M0.6%
Department of Homeland Security
U.S. Customs and Border Protection$12M0.5%
Department of Homeland Security
Office of the Chief Financial Officer$6.6M0.3%
Department of Agriculture

Top recipients

LOCKHEED MARTIN CORP$2.2B92%
32 awards
SIERRA NEVADA COMPANY, LLC$59.4M2.5%
3 awards
CO FIRE AVIATION, INC.$13.5M0.6%
4 awards
THE GEO GROUP, INC.$13.4M0.6%
1 award
EPOCH CONCEPTS LLC$11.2M0.5%
3 awards
ICR, INC.$11M0.5%
19 awards
BRANDES ASSOCIATES, INC.$9.6M0.4%
1 award
PERATON RISK DECISION INC.$9.5M0.4%
3 awards
WOODWARD, INC.$3.6M0.2%
48 awards
LUMEN TECHNOLOGIES GOVERNMENT SOLUTIONS, INC.$3.2M0.1%
3 awards

Open the district page

Campaign money

What the member's campaigns reported receiving, per FEC two-year cycle, and the federal contracts of the organizations that sponsor the giving PACs (each sponsor matched to a contract recipient by AI, with its probability). Comparisons of public records: neither explains the other.

2022 cycle

Raised: $1.6M; through Dec 31, 2022
Cash on hand: $539.3K
From committees: $318.6K; 101 committees
From contractor PACs: $75K; 21 PACs · 24% of committee money

IndividualsPACsPartySelf

Largest gifts from PACs of federal contractors, 2022

PAC sponsor	Given	Matched contract recipient	Its contracts, FY2026
anheuser-busch companies inc.anheuser-busch companies llc political action committee	$10K	ANHEUSER-BUSCH, LLCAI match · 99% · the same organization	—
charter communications inc.charter communications inc. political action committee	$10K	CHARTER COMMUNICATIONS OPERATING, LLCAI match · 100% · of one corporate family	$130.5K
comcast corporationcomcast corporation & nbcuniversal political action committee - federal	$7,500	COMCAST CABLE COMMUNICATIONS, LLCAI match · 100% · of one corporate family	$453.1K
raytheon technologies corporationemployees of raytheon technologies corporation pac	$6,000	RAYTHEON DIGITAL FORCE TECHNOLOGIES, LLCAI match · 90% · of one corporate family	—
american bankers association (aba)american bankers association pac (bankpac)	$5,000	AMERICAN BANKERS ASSOCIATIONAI match · 100% · the same organization	—
qualcomm incorporatedqualcomm incorporated political action committee (qpac)	$5,000	QUALCOMM TECHNOLOGIES INCAI match · 100% · of one corporate family	$93.5K
american dental associationamerican dental association political action committee	$4,500	AMERICAN DENTAL ASSOCIATIONAI match · 98% · the same organization	$78.5K
pfizer inc.pfizer inc. pac	$2,500	PFIZER INCAI match · 100% · the same organization	-$140.2K
chevron corporationchevron employees political action committee - chevron corporation	$2,500	CHEVRON U.S.A. INCAI match · 100% · of one corporate family	$713.4K
northrop grumman corporationemployees of northrop grumman corporation pac	$2,500	NORTHROP GRUMMAN SYSTEMS CORPORATIONAI match · 100% · of one corporate family	$1.1B

Raised is the FEC's cumulative summary of the candidacy; committee money counts each contribution reported, so the two cover slightly different dates.

Terms

Every term in the House or Senate, as published by the congress-legislators project.

House · Colorado's 4th districtJan 3, 2023 – Mar 22, 2024
House · Colorado's 4th districtJan 3, 2021 – Jan 3, 2023
House · Colorado's 4th districtJan 3, 2019 – Jan 3, 2021
House · Colorado's 4th districtJan 3, 2017 – Jan 3, 2019
House · Colorado's 4th districtJan 6, 2015 – Jan 3, 2017

Identifiers

The same member in other public records.

Sources and method

Every figure on this page traces to these records.

Members of Congress, their terms, committees and identifiers (The @unitedstates project (from the Biographical Directory of the U.S. Congress, the House and the Senate))unitedstates/congress-legislators: legislators, committees and current committee membership · data current to Oct 3, 2026 · loaded Oct 3, 2026 · license: CC0 1.0 (public domain dedication)
House roll-call votes (Office of the Clerk, U.S. House of Representatives)Office of the Clerk, U.S. House of Representatives, roll-call vote records · data current to Oct 3, 2026 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
Senate roll-call votes and DW-NOMINATE scores (Voteview (UCLA Department of Political Science))Lewis, Jeffrey B., Keith Poole, Howard Rosenthal, Adam Boche, Aaron Rudkin, and Luke Sonnet (2026). Voteview: Congressional Roll-Call Votes Database. https://voteview.com/ · data current to Oct 3, 2026 · loaded Oct 3, 2026 · license: Free to use with the required citation
Bill status: bills and resolutions, sponsors, actions, subjects and CRS summaries (U.S. Government Publishing Office (GovInfo), from Congress.gov (Library of Congress))GovInfo Bill Status bulk data (Congress.gov; summaries by the Congressional Research Service) · data current to Oct 9, 2026 · loaded Oct 9, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
Congressional district boundaries and relationship files (U.S. Census Bureau)U.S. Census Bureau, Cartographic Boundary Files (congressional districts) and 2020 relationship files · release cd116+cd118+cd119 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
ZIP code (ZCTA) to congressional district crosswalk (U.S. Census Bureau)U.S. Census Bureau, 2020 relationship files (ZCTAs, tracts and congressional districts); shares computed by Analisa · release 2020 · loaded Oct 3, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
Federal contract transactions (Federal Procurement Data System) (U.S. Department of the Treasury, USAspending.gov)USAspending.gov, prime award contract transactions (FPDS) · data current to Oct 9, 2026 · loaded Oct 9, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)
Committees, candidates and committee contributions to candidates (Federal Election Commission)FEC bulk data: committee master, candidate master (candidates' names, no addresses), linkages, PAC summaries, all-candidates summaries and contributions from committees (no individual contributors) · data current to Oct 9, 2026 · loaded Oct 9, 2026 · license: Public domain (U.S. Government work, 17 U.S.C. § 105)

Positions are shown only where a roll call recorded them; voice votes and unanimous consent record none.
Activity counts describe volume and attendance; they are not a measure of quality.
Money and votes are shown side by side; neither explains the other.