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Report: South Carolina's Tim Scott To Endorse Marco Rubio

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AP Photo / Bill Clark

Scott's endorsement would be a boost in South Carolina for Rubio who has struggled to break through in a crowded Republican field dominated by Ted Cruz and Donald Trump.

The South Carolina primary is scheduled for Feb. 20 and will be a key state for Rubio as he battles to stay a top the establishment heap after New Hampshire.

South Carolina's senior Sen. Lindsey Graham (R) already endorsed Jeb Bush.