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Ranking · Senate · Updated Sep 30, 2026

Members who break with their party most: Senate

As of Sep 30, 2026, Sen. John Fetterman (D-PA) has the highest figure in the Senate: 20.5% of party-line votes cast against their own party. Next are Sen. Susan M. Collins (R-ME) at 16.7% and Sen. Lisa Murkowski (R-AK) at 14.7%. 99 members are ranked; the typical (median) member is at 0.8%.

Members ranked
99
Highest
20.5%
Median
0.8%

Top 99

  1. 1. John Fetterman D-PA · Senate20.5%
  2. 2. Susan M. Collins R-ME · Senate16.7%
  3. 3. Lisa Murkowski R-AK · Senate14.7%
  4. 4. Jeanne Shaheen D-NH · Senate14.4%
  5. 5. Angus S. King, Jr. I-ME · Senate12.8%
  6. 6. Margaret Wood Hassan D-NH · Senate12.7%
  7. 7. Rand Paul R-KY · Senate11.8%
  8. 8. Jacky Rosen D-NV · Senate10.4%
  9. 9. Tim Kaine D-VA · Senate9.9%
  10. 10. Mark R. Warner D-VA · Senate9.7%
  11. 11. Mark Kelly D-AZ · Senate8.6%
  12. 12. Catherine Cortez Masto D-NV · Senate8.4%
  13. 13. Ruben Gallego D-AZ · Senate8.1%
  14. 14. Elissa Slotkin D-MI · Senate7.6%
  15. 15. Richard J. Durbin D-IL · Senate6.5%
  16. 16. Martin Heinrich D-NM · Senate6.1%
  17. 17. Christopher A. Coons D-DE · Senate5.9%
  18. 18. Amy Klobuchar D-MN · Senate5.8%
  19. 19. Jack Reed D-RI · Senate5.4%
  20. 20. Gary C. Peters D-MI · Senate5.2%
  21. 21. John W. Hickenlooper D-CO · Senate5.1%
  22. 22. Raphael G. Warnock D-GA · Senate5.0%
  23. 23. Sheldon Whitehouse D-RI · Senate4.9%
  24. 24. Adam B. Schiff D-CA · Senate4.5%
  25. 25. Kirsten E. Gillibrand D-NY · Senate4.4%
  26. 26. Josh Hawley R-MO · Senate4.3%
  27. 27. Andy Kim D-NJ · Senate4.1%
  28. 28. Dan Sullivan R-AK · Senate3.9%
  29. 29. Jon Ossoff D-GA · Senate3.9%
  30. 30. Thom Tillis R-NC · Senate3.5%
  31. 31. Mitch McConnell R-KY · Senate3.4%
  32. 32. Michael F. Bennet D-CO · Senate3.0%
  33. 33. Peter Welch D-VT · Senate3.0%
  34. 34. Cory A. Booker D-NJ · Senate2.9%
  35. 35. Ben Ray Luján D-NM · Senate2.4%
  36. 36. Maria Cantwell D-WA · Senate2.3%
  37. 37. John Thune R-SD · Senate2.3%
  38. 38. Angela D. Alsobrooks D-MD · Senate2.2%
  39. 39. Tammy Baldwin D-WI · Senate2.1%
  40. 40. Bill Cassidy R-LA · Senate2.1%
  41. 41. Alex Padilla D-CA · Senate1.7%
  42. 42. Tammy Duckworth D-IL · Senate1.7%
  43. 43. Jerry Moran R-KS · Senate1.5%
  44. 44. Brian Schatz D-HI · Senate1.3%
  45. 45. Mazie K. Hirono D-HI · Senate1.3%
  46. 46. Richard Blumenthal D-CT · Senate1.2%
  47. 47. Charles E. Schumer D-NY · Senate1.2%
  48. 48. Roger F. Wicker R-MS · Senate1.0%
  49. 49. Mike Rounds R-SD · Senate1.0%
  50. 50. John Boozman R-AR · Senate0.8%
  51. 51. Jon Husted R-OH · Senate0.8%
  52. 52. Shelley Moore Capito R-WV · Senate0.7%
  53. 53. Cindy Hyde-Smith R-MS · Senate0.7%
  54. 54. Mike Lee R-UT · Senate0.6%
  55. 55. Chuck Grassley R-IA · Senate0.6%
  56. 56. John Kennedy R-LA · Senate0.6%
  57. 57. Deb Fischer R-NE · Senate0.6%
  58. 58. Ron Wyden D-OR · Senate0.5%
  59. 59. Kevin Cramer R-ND · Senate0.5%
  60. 60. Jeff Merkley D-OR · Senate0.5%
  61. 61. Todd Young R-IN · Senate0.5%
  62. 62. Lisa Blunt Rochester D-DE · Senate0.5%
  63. 63. Rick Scott R-FL · Senate0.5%
  64. 64. Ashley Moody R-FL · Senate0.5%
  65. 65. Ted Budd R-NC · Senate0.4%
  66. 66. Pete Ricketts R-NE · Senate0.4%
  67. 67. Tommy Tuberville R-AL · Senate0.3%
  68. 68. John Hoeven R-ND · Senate0.2%
  69. 69. Ron Johnson R-WI · Senate0.2%
  70. 70. James Lankford R-OK · Senate0.2%
  71. 71. Edward J. Markey D-MA · Senate0.2%
  72. 72. Christopher Murphy D-CT · Senate0.2%
  73. 73. Tom Cotton R-AR · Senate0.2%
  74. 74. Elizabeth Warren D-MA · Senate0.2%
  75. 75. Joni Ernst R-IA · Senate0.2%
  76. 76. John R. Curtis R-UT · Senate0.2%
  77. 77. Katie Boyd Britt R-AL · Senate0.2%
  78. 78. Tim Sheehy R-MT · Senate0.2%
  79. 79. Bernard Sanders I-VT · Senate0.1%
  80. 80. Patty Murray D-WA · Senate0.1%
  81. 81. Ted Cruz R-TX · Senate0.1%
  82. 82. John Barrasso R-WY · Senate0.1%
  83. 83. Mike Crapo R-ID · Senate0.1%
  84. 84. Tim Scott R-SC · Senate0.1%
  85. 85. Steve Daines R-MT · Senate0.1%
  86. 86. Jim Banks R-IN · Senate0.1%
  87. 87. Cynthia M. Lummis R-WY · Senate0.1%
  88. 88. Eric Schmitt R-MO · Senate0.1%
  89. 89. David McCormick R-PA · Senate0.1%
  90. 90. James C. Justice R-WV · Senate0.1%
  91. 91. John Cornyn R-TX · Senate0.0%
  92. 92. James E. Risch R-ID · Senate0.0%
  93. 93. Marsha Blackburn R-TN · Senate0.0%
  94. 94. Chris Van Hollen D-MD · Senate0.0%
  95. 95. Roger Marshall R-KS · Senate0.0%
  96. 96. Tina Smith D-MN · Senate0.0%
  97. 97. Bill Hagerty R-TN · Senate0.0%
  98. 98. Bernie Moreno R-OH · Senate0.0%
  99. 99. Alan Armstrong R-OK · Senate0.0%

By party

Democrats: 45 ranked, median 3.9%. Republicans: 52 ranked, median 0.3%.

How we count

On votes where most Democrats and most Republicans took opposite sides, the share of the time a member voted with the other party. Only members with at least 50 such votes are ranked.

Source: Voteview roll call records. Every member’s figure links to their profile, which links to the original filings. Data as of Sep 30, 2026, updated daily.

Other rankings

Capitol Receipts is nonpartisan. Every member is measured the same way, from public records.