I can tell you some big-name artists who seem to lean left in country music:
Rodney Crowell (Johnny Cash’s former son-in-law)
Faith Hill (McGraw’s wife)
Garth Brooks (Trisha’s husband)
Not all of them are screaming leftists. I don’t think Garth shoves it down your throat. McGraw can be pretty left wing, though. I quit buying his music when I heard him blaming Bush for Katrina.
As did I.
I never bought his crap because he cannot sing nor can his shrill wife.
After Garth’s first album he went down the suck trail too all screaming and no music, but hey the kids like it ( from Pure Country - a great stab at Garth and all the crock ( country-rock ) losers ).