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.
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 an air of inevitability.
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