YES, he is still having back problems. In the townhall meeting he had in SC...he set the whole time and the way he kept adjusting one of his legs told me he was in pain.
I noticed that the other day. In fact, I noticed he was rubbing his left knee fairly frequently during that interview.
I did not know he had recently had back surgery. Wow, to have stood that long for that debate tonight must have taken a lot of discipline. My heart goes out to him for that.