Following a delayed and controversial response by Donald Trump to the white supremacist rally in Charlottesville, Virginia today, former President Barack Obama has spoken out about the gathering and subsequent violence on social media this evening.While never directly saying the word Charlottesville, the 44th POTUS quoted one of his heroes Nelson Mandela in a trio of tweets poignantly spotlighting foundations of racism and hate. Obama *hasn’t tweeted since July 19, so…

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