Gary Johnson reportedly once asked an aide: 'Who's Harriet Tubman?'
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Diner lands in hot water after racist 'fake' social media post goes viral
'Pure political correctness': Donald Trump criticizes decision to put Harriet Tubman on $20 bill
The US is still trying to decide which woman will be the face of the new $10 bill
Black History Month: 9 Museums That Will Ship You a Piece of Our Past