2016 hopefuls heading to South Carolina for Haley rally

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Sen. Rand PaulRand PaulSaudi skeptics gain strength in Congress Senators challenge status quo on Saudi arms sales Five tips from Trump's fallen rivals on how to debate him MORE (R-S.C.) will also be in the state to fundraise for Rep. Jeff Duncan (R-S.C.).

It's unclear how much help Haley could be in a presidential primary, however. She's faced less-than-stellar approval ratings within the GOP and her endorsement of Mitt Romney in 2012 did little to help his campaign there.

Haley is facing what looks to be a tough challenge from South Carolina state Sen. Vince Sheheen (D), who ran a close race against her in 2010.