South Carolina voters head to the polls on Saturday to cast ballots in a Republican presidential primary that could well determine the political fate of the state’s former governor, Nikki Haley, in her long-shot bid to derail former President Donald J. Trump’s march to the Republican nomination.Here is what to watch in the Palmetto State as votes are tallied Saturday night.How quickly will the race be called?As we saw in the Iowa caucuses and New Hampshire primary last month, the speed of a race call can give the victor — in both of those cases Mr. Trump — a sense of momentum, even…
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