This thread seems worth reviving, as the new "political correctness" in the wake of 9-11 seems to cast liberals (paficists, at least) as "unpatriotic." [Sorry, 'spaw, if you don't like old threads revived, just skip this one.}

Artbrooks, above, made one of the points I was thinking as I read this thread--that Ballad Of The Green Berets could just as easily have been called "folk" as "country," except for people's preconceived ideas about music genres and politics.

FWIW, I have heard folk-style songs written and sung by pro-life protestors at their rallies.
I've heard right-wing sounding talking blues (even on Rush's show).

If you want to see/hear "right wing folk songs," rent the Tim Robbins movie "Bob Roberts." One of the folk songs Bob Roberts (and his folky female partner) sings (in melodious folky style, with guitars) proclaims,
"Drugs stink. They make me sick.
Those that sell 'em, and those that use 'em,
Hang 'em high from the highest tree,
Without a trace of sympathy!"

I might also mention that the song of Hitler Youth (Tomorrow Belongs To Me) sounds, melodically, a lot like the old German folk song Die Lorelei.
Other countries besides the US and the UK, as has been pointed out above, may have plenty of songs that we wouldn't call "liberal."

Genie