I can not see any family resemblances.
However, I really think obama looks like Malcolm X (especially if you look at obama’s childhood pictures compared to X’s other children at the same age)
http://m.youtube.com/watch?v=6jrrnkKmUzo
Hope the link works; if it does, forward to/pause it at the 2:19 mark and compare the side-by-side shot there. I found the resemblance compelling, but of course ymmv.
If the link didn't work just search eww-toob for Dreams From My Real Father and pause at the same point.