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Former President Donald Trump officially locked up enough delegates to become the presumptive GOP presidential nominee after winning Tuesday’s Republican primary in Georgia. However, he has yet to make any efforts to unite his party after dispatching his former UN ambassador Nikki Haley — his last remaining rival — on Super Tuesday. In her concession speech, Haley refused to endorse Trump and said the former president would have to “earn” the votes of her supporters between March and November. Trump has so far not made any direct pleas to Haley voters, and continues to mock the former South Ca…