yes in many (most?) southern states there is a history of voter suppression against minorities and they keep at it any way they can. e.g. see: stacy abrams in ga.
back to the 11 nations business: notice also how both progressive candidates are from yankeedom and do best there (even if warren tanked overall, those were her best regions, and the "left coast" allies).
anyway found this re: why warren lost in mass.
https://www.vox.com/2020/3/3/2116160...-massachusetts
basically: uneducated men hate her (but also, some of her voters love her and want her to stay put). rough fate.
eta: this is her campaign's latest:
https://medium.com/@teamwarren/next-steps-bfa8482e2fbc