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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

CA-12 (Nancy Pelosi-D) 88%
TX-30 (Eddie Bernice Johnson-D) 86%
NJ-08 (Albio Sires-D) 83%
IL-05 (Mike Quigley-D) 82%
PA-01 (Brian Fitzpatrick-R) 82%
NY-03 (Tom Suozzi-D) 82%

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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

CT-03 (Rosa DeLauro-D) 81%
TX-29 (Sylvia Garcia-D) 81%
NY-25 (Joseph Morelle-D) 79%
CA-16 (Jim Costa-D) 79%
FL-07 (Stephanie Murphy-D) 79%
CA-06 (Doris Matsui-D) 79%

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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

NC-01 (G.K. Butterfield-D) 78%
PA-14 (Guy Reschentaler-R) 77%
FL-05 (Alfred Lawson-D) 77%
AL-07 (Terri Sewell-D) 77%
WA-08 (Kim Schrier-D) 76%
TX-32 (Colin Allred-D) 76%

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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

NY-21 (Elise Stefanik-R) 76%
IL-08 (Raja Krishnamoorthi-D) 75%
HI-01 (Ed Case-D) 74%
OH-09 (Marcy Kaptur-D) 74%
IL-14 (Lauren Underwood-D) 74%
TX-28 (Henry Cuellar-D) 74%

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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

MN-04 (Betty McCollum-D) 74%
WI-04 (Gwen Moore-D) 74%
NY-01 (Lee Zeldin-R) 74%
KY-05 (Hal Rogers-R) 74%
CA-31 (Pete Aguilar-D) 73%
CA-29 (Tony Cardenas-D) 73%

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Support for M4A, by district represented by someone who refused to co-sponsor M4A:

MA-06 (Seth Moulton-D) 73%
WI-03 (Ronald Kind-D) 73%
OH-10 (Michael Turner-D) 73%
OR-05 (Kurt Schrader-D) 73%
FL-23 (Debbie Wasserman-Schultz) 73%
SC-06 (James Clyburn) 73%

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These are just the 36 Representatives who are most out of step with their districts on M4A.

In total, 135 of those who refused to co-sponsor M4A represent districts with at least 65% M4A support, 86 Democrats and 49 Republicans.

Sources and notes below

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Sources:

Polling Data-
Nationwide Harvard study of almost 60,000 people.
See question number CC18_327a
https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi%3A10.7910%2FDVN%2FZSBZ7K&fbclid=IwAR2txFWzVMxMdHut_iZliz9WdLk1ggKTpjet4Nc9O6GMqGUM08edrDpYb-c

Co-sponsors-
https://www.congress.gov/bill/116th-congress/house-bill/1384?s=5&r=1384

Spreadsheet of compiled data-
https://docs.google.com/spreadsheets/d/1bRr5bm-XNwPK1olNiS_vP8pxdeVv9oExh-8xkZ4jk5o/edit#gid=0

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Notes:

Question asked was "Thinking now about health care policy, would you support or oppose each of the following proposals? Medicare for all Americans."

I excluded anyone elected in 2020 because the co-sponsor list on http://congress.gov  isn't updated yet