Congress is out of session until Monday, November 9 for the midterm campaign. No new roll-call votes until then; the last were the House on Sep 16 and the Senate on Sep 30.

People / Rankings / Breaks with party

Which Senate Republicans break with their party most often?

Susan M. Collins broke with Republicans most often among the 52 Senate Republicans in the 119th Congress: on 16.7% of party-line votes (median for Senate Republicans 0.3%), as of Nov 2, 2026.

Source: Voteview roll calls (UCLA) · How we measure · Updated Nov 2, 2026

Other rankings
Which Senate Republicans break with their party most often?
RankMemberAgainst own party
1RSusan M. Collins ME Senate16.7% 140 of 840
2RLisa Murkowski AK Senate14.7% 118 of 804
3RRand Paul KY Senate11.8% 94 of 798
4RJosh Hawley MO Senate4.3% 35 of 807
5RDan Sullivan AK Senate3.9% 32 of 815
T-6RMitch McConnell KY Senate3.5% 25 of 724
T-6RThom Tillis NC Senate3.5% 26 of 733
8RJohn Thune SD Senate2.3% 19 of 839
9RBill Cassidy LA Senate2.1% 17 of 797
10RJerry Moran KS Senate1.5% 12 of 789
T-11RMike Rounds SD Senate1.0% 8 of 832
T-11RRoger F. Wicker MS Senate1.0% 8 of 812
T-13RJohn Boozman AR Senate0.8% 7 of 827
T-13RJon Husted OH Senate0.8% 7 of 835
T-15RShelley Moore Capito WV Senate0.7% 6 of 824
T-15RCindy Hyde-Smith MS Senate0.7% 6 of 824
T-17RDeb Fischer NE Senate0.6% 5 of 831
T-17RChuck Grassley IA Senate0.6% 5 of 819
T-17RJohn Kennedy LA Senate0.6% 5 of 824
T-17RMike Lee UT Senate0.6% 5 of 813
T-21RKevin Cramer ND Senate0.5% 4 of 810
T-21RAshley Moody FL Senate0.5% 4 of 826
T-21RRick Scott FL Senate0.5% 4 of 838
T-21RTodd Young IN Senate0.5% 4 of 833
T-25RTed Budd NC Senate0.4% 3 of 815
T-25RPete Ricketts NE Senate0.4% 3 of 832
27RTommy Tuberville AL Senate0.3% 2 of 783
T-28RKatie Boyd Britt AL Senate0.2% 2 of 819
T-28RTom Cotton AR Senate0.2% 2 of 828
T-28RJohn R. Curtis UT Senate0.2% 2 of 822
T-28RJoni Ernst IA Senate0.2% 2 of 822
T-28RJohn Hoeven ND Senate0.2% 2 of 832
T-28RRon Johnson WI Senate0.2% 2 of 828
T-28RJames Lankford OK Senate0.2% 2 of 837
T-28RTim Sheehy MT Senate0.2% 2 of 817
T-36RJim Banks IN Senate0.1% 1 of 830
T-36RJohn Barrasso WY Senate0.1% 1 of 836
T-36RMike Crapo ID Senate0.1% 1 of 829
T-36RTed Cruz TX Senate0.1% 1 of 798
T-36RSteve Daines MT Senate0.1% 1 of 815
T-36RJames C. Justice WV Senate0.1% 1 of 807
T-36RCynthia M. Lummis WY Senate0.1% 1 of 813
T-36RDavid McCormick PA Senate0.1% 1 of 814
T-36REric Schmitt MO Senate0.1% 1 of 829
T-36RTim Scott SC Senate0.1% 1 of 818
T-46RAlan Armstrong OK Senate0.0% 0 of 169
T-46RMarsha Blackburn TN Senate0.0% 0 of 793
T-46RJohn Cornyn TX Senate0.0% 0 of 832
T-46RBill Hagerty TN Senate0.0% 0 of 811
T-46RRoger Marshall KS Senate0.0% 0 of 832
T-46RBernie Moreno OH Senate0.0% 0 of 837
T-46RJames E. Risch ID Senate0.0% 0 of 816

1 member with fewer than 100 roll calls in this Congress is left out until their record is long enough to compare. Members tied on the shown value share a rank and are listed by name.