Peter Welch

Senator · VT · D

Current term Jan 3, 2023 – Jan 3, 2029 · In the Senate since Jan 3, 2023

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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Peter Welch

Senator · VT · D

Current term Jan 3, 2023 – Jan 3, 2029 · In the Senate since Jan 3, 2023

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

28%

19 of 69 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

20%

104 of 510 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

97%

On 798 party-line votes, voted with most Democrats 774 times.

Senate median 99% · Democrats 96%

Voting with the other party

On 843 contested votes, voted the same way as most Republicans 52 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

Bernard SandersIVT26 of theirs · 26 of this member's
Edward J. MarkeyDMA30 of theirs · 8 of this member's
Jeff MerkleyDOR21 of theirs · 12 of this member's
Ron WydenDOR20 of theirs · 12 of this member's
Richard BlumenthalDCT22 of theirs · 7 of this member's
Chris Van HollenDMD18 of theirs · 10 of this member's
Elizabeth WarrenDMA19 of theirs · 6 of this member's
Cory A. BookerDNJ13 of theirs · 10 of this member's
Sheldon WhitehouseDRI19 of theirs · 4 of this member's
Amy KlobucharDMN14 of theirs · 8 of this member's

Across the aisle (Republicans)

Susan M. CollinsRME7 of theirs · 5 of this member's
Marsha BlackburnRTN6 of theirs · 3 of this member's
Chuck GrassleyRIA9 of theirs · 0 of this member's
Josh HawleyRMO6 of theirs · 2 of this member's
Roger MarshallRKS6 of theirs · 2 of this member's
Jerry MoranRKS

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

Ron WydenDOR96% · 790 of 826
Tina SmithDMN96% · 766 of 801
Elizabeth WarrenDMA95% · 790 of 831
Chris Van HollenDMD95% · 788 of 829
Patty MurrayDWA95% · 760 of 801

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 (13). Furthest along first.

Became lawS. 222Whole Milk for Healthy Kids Act of 2025
Original cosponsor · sponsored by Roger Marshall · original backers: 4 D, 7 R · became law Jan 14, 2026
Passed the SenateS. 2666Foreign Robocall Elimination Act
Original cosponsor · sponsored by Ted Budd · original backers: 1 D, 1 R · passed the Senate Aug 3, 2026
Passed the SenateS. 1890Carla Walker Act
Original cosponsor · sponsored by John Cornyn · original backers: 1 D, 1 R · passed the Senate Jun 10, 2026
Passed the SenateS. 4460Rural Community Hospital Demonstration Program Reauthorization
Original cosponsor · sponsored by Chuck Grassley · original backers: 8 D, 8 R · passed the Senate May 20, 2026
Passed the SenateS. 3966TREY'S Law
Original cosponsor · sponsored by Ted Cruz · original backers: 2 D, 3 R · passed the Senate May 20, 2026

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, 6:07 PM ET from Congress.gov and House and Senate roll calls.

119th Congress, Senate.

Bills with other-party backing

28%

19 of 69 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

20%

104 of 510 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

97%

On 798 party-line votes, voted with most Democrats 774 times.

Senate median 99% · Democrats 96%

Voting with the other party

On 843 contested votes, voted the same way as most Republicans 52 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

Bernard SandersIVT26 of theirs · 26 of this member's
Edward J. MarkeyDMA30 of theirs · 8 of this member's
Jeff MerkleyDOR21 of theirs · 12 of this member's
Ron WydenDOR20 of theirs · 12 of this member's
Richard BlumenthalDCT22 of theirs · 7 of this member's
Chris Van HollenDMD18 of theirs · 10 of this member's
Elizabeth WarrenDMA19 of theirs · 6 of this member's
Cory A. BookerDNJ13 of theirs · 10 of this member's
Sheldon WhitehouseDRI19 of theirs · 4 of this member's
Amy KlobucharDMN14 of theirs · 8 of this member's

Across the aisle (Republicans)

Susan M. CollinsRME7 of theirs · 5 of this member's
Marsha BlackburnRTN6 of theirs · 3 of this member's
Chuck GrassleyRIA9 of theirs · 0 of this member's
Josh HawleyRMO6 of theirs · 2 of this member's
Roger MarshallRKS6 of theirs · 2 of this member's
Jerry MoranRKS

Voting most alike

Most alike

Ron WydenDOR96% · 790 of 826
Tina SmithDMN96% · 766 of 801
Elizabeth WarrenDMA95% · 790 of 831
Chris Van HollenDMD95% · 788 of 829
Patty MurrayDWA95% · 760 of 801

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 (13). Furthest along first.

Became lawS. 222Whole Milk for Healthy Kids Act of 2025
Original cosponsor · sponsored by Roger Marshall · original backers: 4 D, 7 R · became law Jan 14, 2026
Passed the SenateS. 2666Foreign Robocall Elimination Act
Original cosponsor · sponsored by Ted Budd · original backers: 1 D, 1 R · passed the Senate Aug 3, 2026
Passed the SenateS. 1890Carla Walker Act
Original cosponsor · sponsored by John Cornyn · original backers: 1 D, 1 R · passed the Senate Jun 10, 2026
Passed the SenateS. 4460Rural Community Hospital Demonstration Program Reauthorization
Original cosponsor · sponsored by Chuck Grassley · original backers: 8 D, 8 R · passed the Senate May 20, 2026
Passed the SenateS. 3966TREY'S Law
Original cosponsor · sponsored by Ted Cruz · original backers: 2 D, 3 R · passed the Senate May 20, 2026

Peter Welch

Working relationships

Peter Welch

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