(CNN) - Herman Cain said Friday he would publicly endorse in the presidential campaign two days before South Carolina's first-in-the-South primary.
The one-time presidential hopeful said on CNN's "The Situation Room with Wolf Blitzer" that he has "no regrets" about dropping from the field and would name his "unconventional" endorsement on Thursday, Jan. 19 at the Southern Republican Leadership Conference.
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"Now, please underscore unconventional because I've been an unconventional candidate, I've had bold ideas," he said, adding he expected voters would think it "creative."
Cain may have offered some insight when asked by Blitzer to offer thoughts on each of his one-time rivals.
Asked about former Massachusetts Gov. Mitt Romney, Cain had only positive things to say: "Obviously, he's very seasoned, good in the debate situation, and I think he would be a good president."
But for the others, he had a mix of praise, and critique.
"The guy with the most creative ideas for addressing our problems, but you not only have to have great ideas to how we address our problem, but you've also got to project the leadership necessary in order to get them done," he said of former House Speaker Newt Gingrich.
He said Texas Gov. Rick Perry and former Pennsylvania Sen. Rick Santorum are not "ready for prime time," though Perry is a "good governor" and Santorum is "a solid politician."
Texas Rep. Ron Paul goes beyond "bold" and is "extreme," he said, and former Utah Gov. Jon Huntsman is not "getting any traction with the voters."
The former Godfather's Pizza executive dropped his bid for the GOP presidential nomination in early December after battling allegations of past sexual harassment. He announced earlier this week a bus tour promoting his 9-9-9 tax plan, a cornerstone of his campaign platform.
The South Carolina primary is Saturday January 21.
CNN's Kevin Liptak and Gregory Wallace contributed to this report.