What does it mean to look "presidential" (or "professorial," or "decanal," or...)?

One of the big stories of the 2016 presidential election is whether Donald Trump looks and acts presidential. This is no idle conversation.  What voters want to know is whether Trump can act like a president is supposed to act, do the things a president is supposed to do, look like a president is supposed to look.  Note that the bar for candidate Trump is very low.  Reading from a teleprompter will do.  Or not behaving like a sixth grade bully.  Note also that the point is not whether he is or can be presidential.  The point is whether he can pass for one.

Think first about what that means.  And think next about who benefits and who does not when we think about candidates, and jobs, and life, in that way.