Young 17 year old white girls in 1960 don’t normally take classes in the Russian Language and have unprotected sex with black men, then run away to Washington State for the next year thereby avoiding the father whomever he was.
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You state those things as facts, there is no solid evidence that is true. Don’t believe everything you read in ‘Dreams’. It’s purpose was to create a past. Take everything you ever read in Dreams or heard from Obong’s blue lips, start from there.
There is plenty of supporting evidence outside of Obama's book. If there is more than one corroboration for a point of fact, I consider it more or less proven. (Depending on how plausible it is.)