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I'm not so sure. Were he to pick Tim Scott, the softening of Biden's support among African-Americans might turn into actual support for Trump. Scott, unlike Obama, is actually properly Black, not mixed-race who qualified as "Black" only because the Left bought into the old racist "one drop rule", and is the descendant of slaves exported by the Kings of Benin and their ilk from West Africa, rather than the descendant of East Africans who were never slaves (or if they were were enslaved by Arabs without being exiled from their homeland). This could provide an interesting dynamic in the election if played right.