Aha. Now I see what inspired your comment calling the original poster un-Christian...you think the word "wench" means "whore."
I'd suggest you call out the original poster on that point, rather than slandering him as un-Christian. He might not have meant the word the way you took it.
"Wench" can simply mean the opposite of lady (in the old-fashioned sense of "lady" meaning a gracious woman, regardless of her economic or social status).
Michelle Obama has amply demonstrated that she is harsh, negative, rude, and condescending. She lacks class in the sense that she is completely un-gracious. "Wench" might not be the word I'd choose for that kind of woman, but it isn't necessarily the wrong word.
For the record, I'm not real thrilled with Cindy McCain either. But for different reasons.