It's irrelevant because he isn't personally displaying the Confederate battle flag:
NBC's Chuck Todd made several attempts on Sunday to get presidential candidate Mike Huckabee to weigh in on whether or not South Carolina should remove the Confederate battle flag from the capitol grounds after the murder of nine black people at a church in Charleston last week. "I still feel like it's not an issue for a presidential candidate," the former Arkansas governor responded.... "I don’t personally display it anywhere, so it’s not an issue for me," Huckabee repeated. "That’s an issue for the people of South Carolina. Do you display it? I doubt it. Does anyone on your panel display it? I doubt it. For us, it’s not an issue."
So displaying the Confederate battle flag is not an issue that Mike Huckabee should have to take a stand on—he seemed annoyed to even be asked about it—because Mike Huckabee isn't personally displaying the Confederate battle flag. The only people who should be asked about displaying the Confederate battle flag, according to Huckabee, are people who are currently displaying the Confederate battle flag. And seeing as their feelings about displaying the Confederate battle flag are obvious—they obviously think it's okay otherwise they wouldn't be displaying the thing in the first place—we don't really need to ask them, do we?
Summing up: Presidential candidates should not take positions on things that they aren't personally doing or personally planning to do. So we can safely assume that Mike Huckabee has personally performed abortions, has personally gotten gay married, has personally immigrated to this country illegally, and has personally attended Beyonce concerts.
Back to TPM:
In 2008, Huckabee addressed the Confederate battle flag at a rally in South Carolina. "You don't like people from outside the state coming in and telling you what to do with your flag," Huckabee said. "In fact, if somebody came to Arkansas and told us what to do with our flag, we'd tell 'em what to do with the pole; that's what we'd do."
But Mike Huckabee reserves the come into your bedroom and tell you what to do with your pole (bio or silicone)—and your ring finger.
UPDATE: Just so there's no confusion about what the Confederate battle flag stands for...
...maybe we should take the word of the man who designed it.