I don't care about the politics of the singer as long as they sing good songs well - and I don't even have to agree with the message of the song to like it. I know there are singers with whom I would strongly disagree if we got into a political discussion but I don't care as long as they don't shove the message (even one I agree with to be honest) down my throat during performances.

The possible suggestion by some in folk that you have to be left wing to sing folk is rubbish. I think most traditional folk songs can be broken down into the following groups:
- A bit of fun with no political leaning
- Irrelevant to current politics
- About historical events
- Social history

Then there's the occasional one which might present an "issue" - so you either don't sing it or sing it because it's a good song never mind the message.

Presumably if you are writing your own songs or using more modern political songs you will have to use your judgement.

Either way, if you're not going to get into a political diatribe in concert (and I'd implore you not to whatever your leaning - I'd suggest it will put off 3/4 of your audience, not 1/2) then no one will be the wiser unless they start to look into your background.