I don't think they look anything alike. Curious.
Let's put it this way...
If (God forbid) one became President, and the other gave up politics for an acting career. And Hollywood made a TV movie about the President, and cast the actor to play him...
People would say the choice of casting was obvious, but no-one would be fooled that it was the real President.
Obama's ears stick out like a car with its doors open... I would find them hard to confuse.
Neither of them look a thing like Rayfield Wright, but they have a certain resemblance. At least from those pictures. I'm not really familiar with how Ford looks in person.
Well, if one views them from some distance, and doesn't have too good an eyesight to boot - then it ought to be excusable. I, for one, mistake people with unpleasant frequency.