Mark R. Warner

Senator · VA · D

Current term Jan 3, 2021 – Jan 3, 2027 · In the Senate since Jan 6, 2009

Official website Contact form Biographical Directory

Portrait: U.S. Government Publishing Office, via unitedstates/images (public domain)

Working relationships

How often this member works with colleagues across party lines, from bill sponsorships and recorded votes in this Congress. Bills are H.R., S., H.J.Res. and S.J.Res.; resolutions, post office namings, and Congressional Gold Medal and commemorative coin bills are left out. Independents are counted with the party they caucus with. These figures describe the public record; they do not measure effectiveness or ideology.

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Mark R. Warner

Senator · VA · D

Current term Jan 3, 2021 – Jan 3, 2027 · In the Senate since Jan 6, 2009

Official website Contact form Biographical Directory

Portrait: U.S. Government Publishing Office, via unitedstates/images (public domain)

Working relationships

119th Congress, Senate.

Bills with other-party backing

49%

29 of 59 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

42%

110 of 265 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

90%

On 804 party-line votes, voted with most Democrats 726 times.

Senate median 99% · Democrats 96%

Voting with the other party

15%

On 855 contested votes, voted the same way as most Republicans 126 times.

Senate median 6% · Democrats 8%

Closest collaborators

Counted both ways: bills by the colleague that this member cosponsored, and bills by this member that the colleague cosponsored.

All colleagues

Tim KaineDVA20 of theirs · 13 of this member's
Chris Van HollenDMD14 of theirs · 8 of this member's
Angela D. AlsobrooksDMD6 of theirs · 8 of this member's
Marsha BlackburnRTN11 of theirs · 2 of this member's
Brian SchatzDHI7 of theirs · 4 of this member's
Ron WydenDOR7 of theirs · 4 of this member's
Catherine Cortez MastoDNV8 of theirs · 3 of this member's
Tammy DuckworthDIL5 of theirs · 5 of this member's
Susan M. CollinsRME7 of theirs · 3 of this member's
Tina SmithDMN6 of theirs · 3 of this member's

Across the aisle (Republicans)

Marsha BlackburnRTN11 of theirs · 2 of this member's
Susan M. CollinsRME7 of theirs · 3 of this member's
Todd YoungRIN6 of theirs · 2 of this member's
Jerry MoranRKS7 of theirs · 1 of this member's
Jon HustedROH5 of theirs · 2 of this member's
Tim ScottRSC5 of theirs · 2 of this member's

Voting most alike

Contested roll calls (at least 10% of yea and nay votes on the losing side) on which both voted yea or nay, and how often they made the same choice. Colleagues who shared too few of these votes with this member are not ranked.

Most alike

Ruben GallegoDAZ94% · 699 of 746
Christopher A. CoonsDDE93% · 756 of 809
Elissa SlotkinDMI93% · 777 of 832
John W. HickenlooperDCO93% · 789 of 846
Jacky RosenDNV93% · 784 of 843

Bipartisan bills that advanced

Bills this member sponsored or joined as an original cosponsor, with original backers from both parties, that passed at least one chamber (7). Furthest along first.

Became lawS. 4465A bill to amend the FISA Amendments Act of 2008 to extend the authorities of title VII of the Foreign Intelligence Surveillance Act of 1978, and for other purposes.
Original cosponsor · sponsored by Tom Cotton · original backers: 1 D, 1 R · became law Apr 30, 2026
Passed the SenateS. 3315Health Care Cybersecurity and Resiliency Act of 2026
Original cosponsor · sponsored by Bill Cassidy · original backers: 2 D, 2 R · passed the Senate Sep 30, 2026
Passed the SenateS. 4395Terrorism Risk Insurance Program Reauthorization Act of 2026
Original cosponsor · sponsored by David McCormick · original backers: 10 D, 13 R · passed the Senate Sep 28, 2026
Passed the SenateS. 1473Stop Stealing our Chips Act
Original cosponsor · sponsored by Mike Rounds · original backers: 1 D, 1 R · passed the Senate May 20, 2026
Passed the SenateS. 921Tyler’s Law

Each member's party on each date comes from congress-legislators term records. Party-line votes are roll calls on which most voting Democrats and most voting Republicans took opposite sides; procedural votes are included. The Vice President's tie-breaking votes and impeachment verdicts are not counted, and a bill enacted as part of another bill counts only at the stage it reached on its own. Medians include everyone who served in the chamber this Congress with enough records (5 sponsored bills, 10 cosponsorships, 25 votes). Computed Oct 23, 2026, 11:51 AM ET from Congress.gov and House and Senate roll calls.

119th Congress, Senate.

Bills with other-party backing

49%

29 of 59 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

42%

110 of 265 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

90%

On 804 party-line votes, voted with most Democrats 726 times.

Senate median 99% · Democrats 96%

Voting with the other party

15%

On 855 contested votes, voted the same way as most Republicans 126 times.

Senate median 6% · Democrats 8%

Closest collaborators

Counted both ways: bills by the colleague that this member cosponsored, and bills by this member that the colleague cosponsored.

All colleagues

Tim KaineDVA20 of theirs · 13 of this member's
Chris Van HollenDMD14 of theirs · 8 of this member's
Angela D. AlsobrooksDMD6 of theirs · 8 of this member's
Marsha BlackburnRTN11 of theirs · 2 of this member's
Brian SchatzDHI7 of theirs · 4 of this member's
Ron WydenDOR7 of theirs · 4 of this member's
Catherine Cortez MastoDNV8 of theirs · 3 of this member's
Tammy DuckworthDIL5 of theirs · 5 of this member's
Susan M. CollinsRME7 of theirs · 3 of this member's
Tina SmithDMN6 of theirs · 3 of this member's

Across the aisle (Republicans)

Marsha BlackburnRTN11 of theirs · 2 of this member's
Susan M. CollinsRME7 of theirs · 3 of this member's
Todd YoungRIN6 of theirs · 2 of this member's
Jerry MoranRKS7 of theirs · 1 of this member's
Jon HustedROH5 of theirs · 2 of this member's
Tim ScottRSC5 of theirs · 2 of this member's

Voting most alike

Most alike

Ruben GallegoDAZ94% · 699 of 746
Christopher A. CoonsDDE93% · 756 of 809
Elissa SlotkinDMI93% · 777 of 832
John W. HickenlooperDCO93% · 789 of 846
Jacky RosenDNV93% · 784 of 843

Bipartisan bills that advanced

Bills this member sponsored or joined as an original cosponsor, with original backers from both parties, that passed at least one chamber (7). Furthest along first.

Became lawS. 4465A bill to amend the FISA Amendments Act of 2008 to extend the authorities of title VII of the Foreign Intelligence Surveillance Act of 1978, and for other purposes.
Original cosponsor · sponsored by Tom Cotton · original backers: 1 D, 1 R · became law Apr 30, 2026
Passed the SenateS. 3315Health Care Cybersecurity and Resiliency Act of 2026
Original cosponsor · sponsored by Bill Cassidy · original backers: 2 D, 2 R · passed the Senate Sep 30, 2026
Passed the SenateS. 4395Terrorism Risk Insurance Program Reauthorization Act of 2026
Original cosponsor · sponsored by David McCormick · original backers: 10 D, 13 R · passed the Senate Sep 28, 2026
Passed the SenateS. 1473Stop Stealing our Chips Act
Original cosponsor · sponsored by Mike Rounds · original backers: 1 D, 1 R · passed the Senate May 20, 2026
Passed the SenateS. 921Tyler’s Law

Mark R. Warner

Working relationships

Mark R. Warner

Working relationships

Closest collaborators

All colleagues

Across the aisle (Republicans)

Voting most alike

Most alike

Bipartisan bills that advanced

Closest collaborators

All colleagues

Across the aisle (Republicans)

Voting most alike

Most alike

Bipartisan bills that advanced

Most alike among Republicans