Doesn’t get much clearer than this.
The wonky H.W. and Obama are chatting it up, with Obama looking quite serious. Dubya is grinning off center of the camera, seemingly looking for someone to joke with (I don’t mean this in a derogatory way. Bush was great at joking around with the press corps). Clinton is casually striking a pose, seemingly the only one aware that a photo is being taken.
And Jimmy Carter, visibly separated from the group, looks on wistfully, alone.
It’s hard to look at this picture and not to want to do some backseat psychology.
(picture found here)