I’d say tread carefully and combine that with determining what stage of liberal dementia they are in. If it’s the early stages, then you can provide them with facts in a light-toned way. If they are already mush brained, it will be too late and all you can do is smile and let the election results do the talking.
Great stuff. Thanks. Fortunately, I've met VERY FEW people who have said they are flat-out "voting for Obama". I guarantee that I'd like to speak with folks with this diminished mental capacity......but have not YET. I'll check back with some of the usual suspects.....but your're right.....they may be too far gone.
If politics and candidates come up, I try to make non-committal comments like “it sure looks like it will be a close election”, or “what a great fireworks show at Obama’s speech, he has lots of enthusiastic supporters”. Though I try not to talk about politics and sex and religion at all.