COLUMBIA, South Carolina (Reuters) - Democrat Hillary Clinton and Republican Mitt Romney were projected to win Nevada's presidential nominating contests on Saturday and voters in South Carolina cast ballots as an unpredictable White House race moved to the South and West.

Major networks projected the Nevada victory for the New York senator, giving the former first lady who would be the first woman president added momentum going into the multiple contests that lie ahead in the nominating race for the U.S. presidential election in November.

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