Taken out of context, probably B, since it's a mixed-race family. Taken with context, possibly A, though white nationalists could take the optimistic (for them) route in assuming Obama will be impeached and/or will be the only black president.
EDIT: If there's anybody who trolls those sites to make fun of them, how are those types of people reacting, by the way?
I ran a poll at my school among the racists and I showed them a pic of Black Family ( not Obama ) and pic of Bill and his family. 67% found the Black family worse.