Sanford's book project still a mystery

Jenny Sanford said her husband was writing a book, but the governor's aides are remaining mum.

COLUMBIA, South Carolina (CNN) – Mark Sanford has been working on a book, according to his wife Jenny, but Sanford's political team is so far keeping quiet about it.

Was the book meant to be a platform for Sanford to travel the country in advance of a 2012 presidential bid? No one is saying.

Last Friday, Jenny Sanford told the Associated Press that her husband told her when they separated that he needed to get away to clear his head and work on writing a book. Sanford, though, went to Argentina to visit his mistress against his wife's wishes.

"I had every hope he was not going to see her," she told the AP.

In a brief e-mail message to CNN, she said any details about the book need to be discussed with the governor.

But Sanford spokesman Joel Sawyer would not elaborate. "I don't have any details for you about that," he said.

Jon Lerner, Sanford's top political adviser in Washington, also refused to comment Tuesday when asked if Sanford is writing a book.