I've thought the same thing as long as he has been in the public eye. Yesterday afternoon Fox News caught a glimpse of him after the Inauguration when he was smiling at the camera and then he suddenly wiggled both eyebrows at someone with a twinkle in his eye! It was so cute.
Think about what he's been through. Think about the burden he bears.
That twinkle, IMO, is an indication that he is resting in the Lord and in HIS love and peace..........and Laura's adoration of him doesn't hurt either! ;o)