Just a Coincidence but I Do See a Resemblance
I must have a good imagination because I think there is a resemblance. In fact, when I opened the screengrab this morning I assumed it was a Photoshop.
Headshots of the actor with a beard look nothing like the President but in the actual show he does look a bit like Obama might in another 20 years (or maybe 25).
I'm not sure who was first to notice it but from what I read this morning, one of the first was Glenn Beck who tweeted it out while the show was airing. Beck has been supportive of the show/series so I don't think his intent was to mire the show in controversy.
I'm sure it's just a weird coincidence. In this case I really don't think anyone was trying to make a point of any kind.