The former Godfather's Pizza CEO has run a non-traditional presidential campaign and is the only top GOP contender who has not previously held elected office.
He has gained both positive and negative attention for his sometimes controversial language in speeches and interviews.
Cain drew criticism for his statements about immigration last week, in which he said his administration would build a 20-foot electrified border fence to keep out illegal immigrants.
"When I'm in charge of the fence, we going to have a fence. It's going to be 20 feet high. It's going to have barbed wire on the top. It's going to be electrocuted, electrified," Cain said.
He later walked back his remarks, saying he was joking about the "electrified" U.S.-Mexico border fence.
Last month, Cain was also criticized when he said that the black community was "brainwashed" into traditionally voting for Democratic lawmakers.
"I stand my ground, some of them are brainwashed because they won't consider another alternative," said Cain in the Fox News interview. "But I always say the good news is a large percentage of black people are thinking for themselves."
The GOP hopeful has cited his lack of political correctness as a source of pride and sign of honesty to voters.
"My sense of humor it's not going to go away, so they may as well get used to it," said Cain.