Here we have John Adams. Presumedly, the artist for this coin thought that it would be appropriate if the second President of the US (who was a side-kick to the first President) looked more like Higgins (who was a side-kick to Magnum, P.I.).
Then there's George Washington. When comparing the image of George to that of the Presidential spouses, you can see the strikingly creepy resemblance that he bears to Mrs. Abigail Adams, the wife of the Presidential side-kick (not the Tom Selleck side-kick) shown above..
And our eighth president, the actor Christopher Lloyd. Oh, wait! Sorry. Got confused. Van Buren. Martin Van Buren was the eighth President. (You can see where I was led astray, can't you?)