Sanford wasn't biting.
Colbert Busch, saying she would use her years of business experience including her work in the steam industry, criticized Sanford for voting in Congress against harbor dredging and building a higher bridge so the Port of Charleston could handle a new generation of larger container ships.
"My opponent voted against the dredging and voted against the bridge," said Colbert Busch, the sister of comedian Stephen Colbert.
Sanford shot back that, if it bothered her so much before "I don't think you would have written me a $500 check as I left the Congress to run for governor. I don't think it must have bothered her that much." He said he opposed the money coming in the form of earmarks.
"I was against earmarks before being against earmarks was cool," he said.
The Democrat responded that Sanford had years ago told her he supported trade and dredging.
"You didn't tell the truth," she told Sanford. "You turned around and did the opposite."
Colbert Busch also said that, if elected, she would return 10 percent of her congressional salary to the government.
The candidates also differed over issues such as immigration reform, the federal health care overhaul and abortion during the debate sponsored by the Patch news service, the South Carolina Radio Network, Charleston television station WCBD and which was telecast by C-SPAN.