About 100 people turned out at the College of Charleston as Haley appeared with former Massachusetts Gov. Mitt Romney and his wife Ann, popular former first lady Jenny Sanford and primary opponent Henry McMaster, who this week endorsed Haley.

One of the tricky things in a runoff is trying to determine where votes for the other two candidates go, said Brian McGee, an expert in political communications at the College of Charleston.

“Are they going to split in predictable ways — in which case Ms. Haley should win relatively easily — or is she the fourth choice for a large number of voters who voted for the other three?” he asked.

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