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It is demonstrably true.
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Polling indicated Trump was getting 25% of the Black vote. No GOP candidate has gotten that since Nixon in 1960. The Democrats can’t lose more than 10% of the Black vote or they lose outright. Running against one of the 3 Stalinist senile cretins for the Democrats (Bernie, the Butcheress of Benghazi, or Plugs Biden) and it’s a no brainer who wins.