In the MSM's stereotypical world...
If Barack Obama's maternal Great-Grandfather had a son,
Barack Obama's Great-Grandfather, Rolla Charles Payne, a descendant of slave owners, and his wife, Leona Belle McCurry Payne
....he should have looked like Opie Taylor from Mayberry.
If George Zimmerman's maternal Great-Grandfather had a son,
George Michael Zimmerman's Mum, Gladys Mesa Zimmerman's "grandfather," an Afro-Peruvian descendant of African slaves.
...he should have looked like Trayvon Martin.