I'm not watching it either, but was reading the article the OP was based on a little earlier today, as well as a bunch of the comments at the end.
Apparently, according to many of the comments, the "good guys" are significantly fairer-skinned than the villains, but the powers that be behind the series are not (naturally) admitting to that being anything but coincidence, and claim the utmost of respect for Obama. I haven't checked the cast list to compare ethnicity to degree of menace for myself, though.
It does seem, in today's politically correct climate, though, that a definite pattern of casting evil characters with darker-skinned actors would have been caught and corrected somewhere in the production phase.