Texas Gov. Rick Perry and former Massachusetts Gov. Mitt Romney had a spirited exchange about controversial sentences in their respective books.
Romney got the ball rolling after Perry said he had no desire to shift Social Security entirely to the states.
"The bottom line is we never said we're going to move this back to the states," Perry said.
Romney accused Perry of saying in his book, Fed Up!, that the federal government "shouldn't be in the Social Security business."
"So you better find that Rick Perry and get him to stop saying that," Romney said.
Perry shot back by noting that Romney had written about nationalized health care in the hardcover version of his book and then taken it out for the paperback version.
Romney's response: "I actually wrote my book."