Understanding the Significance of Juneteenth CNN Inside Politics

First: Today is Juneteenth, a day to commemorate the end of slavery and an awful chapter in US history. Politics, of course, are part of it too, with the Biden campaign highlighting what it calls flagrant racism from Donald Trump. 
Plus: Trump says he'll rip up and throw out Joe Biden's new immigration plans on day one of a second term. 
And: Just 345 votes separate an ultraconservative congressman and his Trump-endorsed challenger in a bitter Virginia Republican primary. 
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