I think maybe one of his “tells” is to flash that big smile. It’s gotten him far in life, just like Obama’s, but maybe it means he’s trying to keep his cool. If so, that’s when Trump should hammer him harder to try to make him crack. Because it’s definitely not pretty when he does.
That reminds me. I don’t like old people with teeth whiter than a sheet of paper. George Mitchell was the first politician that I noticed had teeth that had to be fake.