Most Conservative U.S. Senators of 2023

The top-ranked U.S. Senators by 2023 CMA scorecard score, based on substantive votes tracked by Competitive Markets Action.

See the methodology page for how scores are calculated.

Rank	Lawmaker	Party / State / District	2023 Score
1	Sen. Rand Paul	R-KY	100%
2	Sen. Edward Markey	D-MA	100%
3	Sen. Mike Lee	R-UT	100%
4	Sen. Elizabeth Warren	D-MA	100%
5	Sen. Kirsten Gillibrand	D-NY	100%
6	Sen. Cory Booker	D-NJ	100%
7	Sen. Todd Young	R-IN	50%
8	Sen. Jon Tester	D-MT	50%
9	Sen. Margaret Hassan	D-NH	50%
10	Sen. Cynthia Lummis	R-WY	50%
11	Sen. Mitt Romney	R-UT	50%
12	Sen. Amy Klobuchar	D-MN	50%
13	Sen. Dianne Feinstein	D-CA	50%
14	Sen. Mazie Hirono	D-HI	50%
15	Sen. Lindsey Graham	R-SC	50%
16	Sen. John Fetterman	D-PA	50%
17	Sen. Richard Durbin	D-IL	50%
18	Sen. Jacky Rosen	D-NV	50%
19	Sen. Angus King	I-ME	50%
20	Sen. Tim Kaine	D-VA	50%
21	Sen. Laphonza Butler	D-CA	50%
22	Sen. Marco Rubio	R-FL	50%
23	Sen. Bob Casey	D-PA	50%
24	Sen. Brian Schatz	D-HI	50%
25	Sen. Bill Cassidy	R-LA	50%
26	Sen. John Hoeven	R-ND	50%
27	Sen. Mark Warner	D-VA	50%
28	Sen. Alex Padilla	D-CA	50%
29	Sen. Tammy Baldwin	D-WI	50%
30	Sen. Thomas Carper	D-DE	50%
31	Sen. Richard Burr	R-NC	50%
32	Sen. Christopher Murphy	D-CT	50%
33	Sen. Richard Blumenthal	D-CT	50%
34	Sen. Jeanne Shaheen	D-NH	50%
35	Sen. Rick Scott	R-FL	50%
36	Sen. Mitch McConnell	R-KY	50%
37	Sen. Benjamin Cardin	D-MD	50%
38	Sen. Maria Cantwell	D-WA	50%
39	Sen. Kamala Harris	D-CA	50%
40	Sen. J.D. Vance	R-OH	50%
41	Sen. Jack Reed	D-RI	50%
42	Sen. Jon Ossoff	D-GA	50%
43	Sen. Patty Murray	D-WA	50%
44	Sen. Jerry Moran	R-KS	50%
45	Sen. Joshua Hawley	R-MO	50%
46	Sen. Martin Heinrich	D-NM	50%
47	Sen. Debbie Stabenow	D-MI	50%
48	Sen. Michael Crapo	R-ID	50%
49	Sen. Katie Britt	R-AL	50%
50	Sen. Shelley Capito	R-WV	50%