Afraid of your melanin
The same as it's ever been
That ain't gonna change
With the race of the president

from Lowkey – OBAMA NATION Lyrics on Rap Genius

Meaning

The level of melanin in the skin determines the complexion/colour of a person.

Back when slavery was still hip everywhere, particularly in the U.S., accusing someone of having any African in their blood was a pretty damaging accusation. It could destroy your life — families split up, marriages obliterated, etc. As such, people went out of their way to prove they were pure bred.

Lowkey is saying that in effect hasn’t changed.

The fact Obama is black doesnt change anything.. America is still institutionally racist.

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