Donald Trump. Photo: Gage Skidmore.

New York Times – Donald J. Trump won a clear victory in the South Carolina primary on Saturday, cementing his position as the Republican presidential front-runner as he enters a tougher test in a series of potentially decisive March contests.

Mr. Trump ran ahead of Senators Ted Cruz of Texas and Marco Rubio of Florida, who were locked in a battle for second place. Both have struggled to become the principal alternative to Mr. Trump, a larger-than-life candidate from outside the political system whose nomination would upend the Republican Party.

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