25%, if Obama's actual ancestry is what he claims.
During the "Slave" years, a Quadroon (25% Caucasian) was considered legally white in Virginia. Sally Hemmings, TJ's slave, was an Octoroon (1/8 white).
A Quadroon is 1/4 Black, not 1/4 White. And an Octoroon is 1/8 Black, not 1/8 White.
Duh.
I shouldn't post when I'm tired.
I'm surprised nobody else caught it. Maybe y'all are just really polite. ☺☻☺☻☺☻