Cesca and Sean Quinn over at Five Thirty Eight highlight the tongue-jutting behavior of John McCain. Some body language experts call this reptile brain behavior a classic poker tell. I don't know, but I wouldn't put it past the old man to have a facial tic or two, whether it signals anything or not. If it did, think about how that would play into the hands of other heads of state. All they'd need to do is look for the classic tell and they'd know when he was lying to them or feeling really good about what he's saying, thinking it will drive home a particularly important point. They could play him right and left.
I wonder if the reporters who got invited out to the McCain homestead for BBQ over the summer got to play poker with him too.