He's not backing off this nonsense since he first wrote it in his book:
KEYES: But should states-rights supporters be worried that, as governor you said that Social Security is not something that falls in the purview of the federal government, but in your campaign, have backed off that?
PERRY: I haven’t backed off anything in my book. Read the book again, get it right. Next question.
His book is titled "Fed Up!" -- it should have been titled "F'ed Up!"