Edward J. Markey

Senator · MA · D

Current term Jan 3, 2021 – Jan 3, 2027 · In the Senate since Jul 16, 2013

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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Edward J. Markey

Senator · MA · D

Current term Jan 3, 2021 – Jan 3, 2027 · In the Senate since Jul 16, 2013

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

11 of 142 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

26 of 360 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

>99%

On 834 party-line votes, voted with most Democrats 832 times.

Senate median 99% · Democrats 96%

Voting with the other party

On 887 contested votes, voted the same way as most Republicans 15 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

Elizabeth WarrenDMA27 of theirs · 59 of this member's
Richard BlumenthalDCT27 of theirs · 49 of this member's
Bernard SandersIVT21 of theirs · 48 of this member's
Jeff MerkleyDOR14 of theirs · 50 of this member's
Cory A. BookerDNJ17 of theirs · 40 of this member's
Alex PadillaDCA20 of theirs · 33 of this member's
Ron WydenDOR12 of theirs · 39 of this member's
Chris Van HollenDMD10 of theirs · 32 of this member's
Peter WelchDVT8 of theirs · 30 of this member's
Mazie K. HironoDHI9 of theirs · 23 of this member's

Across the aisle (Republicans)

Lisa MurkowskiRAK4 of theirs · 4 of this member's
Roger F. WickerRMS2 of theirs · 3 of this member's
Shelley Moore CapitoRWV0 of theirs · 5 of this member's
Bill CassidyRLA2 of theirs · 2 of this member's
Steve DainesRMT2 of theirs · 2 of this member's
Dan SullivanRAK

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

Elizabeth WarrenDMA>99% · 871 of 873
Bernard SandersIVT99% · 820 of 825
Christopher MurphyDCT99% · 855 of 863
Jeff MerkleyDOR99% · 868 of 880
Chris Van HollenDMD99% · 861 of 873

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 (8). Furthest along first.

Became lawS. 3971Small Business Innovation and Economic Security Act
Original cosponsor · sponsored by Joni Ernst · original backers: 1 D, 1 R · became law Apr 13, 2026
Passed the SenateS. 2120Older Americans Act Reauthorization Act of 2025
Original cosponsor · sponsored by Bill Cassidy · original backers: 5 D, 5 R · passed the Senate Jul 14, 2026
Passed the SenateS. 4822Saving the OOI Act of 2026
Original cosponsor · sponsored by Lisa Murkowski · original backers: 10 D, 2 R · passed the Senate Jun 17, 2026
Passed the SenateS. 843Sea Turtle Rescue Assistance and Rehabilitation Act of 2025
Sponsor · original backers: 3 D, 3 R · passed the Senate Mar 22, 2026
Passed the SenateS. 1092WIPPES Act
Original cosponsor · sponsored by Jeff Merkley · original backers: 8 D, 1 R · passed the Senate Mar 22, 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, 11:51 AM ET from Congress.gov and House and Senate roll calls.

119th Congress, Senate.

Bills with other-party backing

11 of 142 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Democrats 35%

Cosponsoring the other party's bills

26 of 360 bills they cosponsored were introduced by a Republican.

Senate median 19% · Democrats 22%

Voting with own party

>99%

On 834 party-line votes, voted with most Democrats 832 times.

Senate median 99% · Democrats 96%

Voting with the other party

On 887 contested votes, voted the same way as most Republicans 15 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

Elizabeth WarrenDMA27 of theirs · 59 of this member's
Richard BlumenthalDCT27 of theirs · 49 of this member's
Bernard SandersIVT21 of theirs · 48 of this member's
Jeff MerkleyDOR14 of theirs · 50 of this member's
Cory A. BookerDNJ17 of theirs · 40 of this member's
Alex PadillaDCA20 of theirs · 33 of this member's
Ron WydenDOR12 of theirs · 39 of this member's
Chris Van HollenDMD10 of theirs · 32 of this member's
Peter WelchDVT8 of theirs · 30 of this member's
Mazie K. HironoDHI9 of theirs · 23 of this member's

Across the aisle (Republicans)

Lisa MurkowskiRAK4 of theirs · 4 of this member's
Roger F. WickerRMS2 of theirs · 3 of this member's
Shelley Moore CapitoRWV0 of theirs · 5 of this member's
Bill CassidyRLA2 of theirs · 2 of this member's
Steve DainesRMT2 of theirs · 2 of this member's
Dan SullivanRAK

Voting most alike

Most alike

Elizabeth WarrenDMA>99% · 871 of 873
Bernard SandersIVT99% · 820 of 825
Christopher MurphyDCT99% · 855 of 863
Jeff MerkleyDOR99% · 868 of 880
Chris Van HollenDMD99% · 861 of 873

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 (8). Furthest along first.

Became lawS. 3971Small Business Innovation and Economic Security Act
Original cosponsor · sponsored by Joni Ernst · original backers: 1 D, 1 R · became law Apr 13, 2026
Passed the SenateS. 2120Older Americans Act Reauthorization Act of 2025
Original cosponsor · sponsored by Bill Cassidy · original backers: 5 D, 5 R · passed the Senate Jul 14, 2026
Passed the SenateS. 4822Saving the OOI Act of 2026
Original cosponsor · sponsored by Lisa Murkowski · original backers: 10 D, 2 R · passed the Senate Jun 17, 2026
Passed the SenateS. 843Sea Turtle Rescue Assistance and Rehabilitation Act of 2025
Sponsor · original backers: 3 D, 3 R · passed the Senate Mar 22, 2026
Passed the SenateS. 1092WIPPES Act
Original cosponsor · sponsored by Jeff Merkley · original backers: 8 D, 1 R · passed the Senate Mar 22, 2026

Edward J. Markey

Working relationships

Edward J. Markey

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