Is it just a coincidence?

Is it just a coincidence that the only two black people advanced by the Democrat party to the White house are both only half-black?

Barack Hussein Obama II had a Kenyan father and Caucasian American mother.
Obamas parents
Obama's parents
Kamala Harris has a Jamaican father and an Indian mother.
Kamala Harris parents
Kamala Harris' parents
If the Democrat party is such an advocate of minority rights, why haven't they advanced a "fully" black person to the White House?
Is it just a coincidence?
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