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. Edward Markey	D-MA	100%
2	Sen. Kirsten Gillibrand	D-NY	100%
3	Sen. Rand Paul	R-KY	100%
4	Sen. Mike Lee	R-UT	100%
5	Sen. Elizabeth Warren	D-MA	100%
6	Sen. Cory Booker	D-NJ	100%
7	Sen. Marco Rubio	R-FL	50%
8	Sen. Tim Kaine	D-VA	50%
9	Sen. Mark Kelly	D-AZ	50%
10	Sen. Richard Blumenthal	D-CT	50%
11	Sen. Joshua Hawley	R-MO	50%
12	Sen. Katie Britt	R-AL	50%
13	Sen. Bill Cassidy	R-LA	50%
14	Sen. Tammy Baldwin	D-WI	50%
15	Sen. John Boozman	R-AR	50%
16	Sen. Laphonza Butler	D-CA	50%
17	Sen. Marsha Blackburn	R-TN	50%
18	Sen. Todd Young	R-IN	50%
19	Sen. Mark Warner	D-VA	50%
20	Sen. Sheldon Whitehouse	D-RI	50%
21	Sen. Richard Burr	R-NC	50%
22	Sen. Michael Bennet	D-CO	50%
23	Sen. Raphael Warnock	D-GA	50%
24	Sen. Tommy Tuberville	R-AL	50%
25	Sen. Christopher Murphy	D-CT	50%
26	Sen. John Hoeven	R-ND	50%
27	Sen. Cynthia Lummis	R-WY	50%
28	Sen. Cindy Hyde-Smith	R-MS	50%
29	Sen. Ron Wyden	D-OR	50%
30	Sen. Mike Braun	R-IN	50%
31	Sen. Maria Cantwell	D-WA	50%
32	Sen. Angus King	I-ME	50%
33	Sen. Richard Shelby	R-AL	50%
34	Sen. Catherine Cortez Masto	D-NV	50%
35	Sen. Mazie Hirono	D-HI	50%
36	Sen. Patrick Leahy	D-VT	50%
37	Sen. John Hickenlooper	D-CO	50%
38	Sen. Michael Crapo	R-ID	50%
39	Sen. Patrick Toomey	R-PA	50%
40	Sen. Steve Daines	R-MT	50%
41	Sen. Jeff Merkley	D-OR	50%
42	Sen. Ron Johnson	R-WI	50%
43	Sen. Robert Menendez	D-NJ	50%
44	Sen. James Lankford	R-OK	50%
45	Sen. Mitch McConnell	R-KY	50%
46	Sen. Joe Manchin	I-WV	50%
47	Sen. Christopher Coons	D-DE	50%
48	Sen. Bernard Sanders	I-VT-12	50%
49	Sen. Benjamin Cardin	D-MD	50%
50	Sen. Margaret Hassan	D-NH	50%