Wisconsin Gov. Scott Walker says his new book is not a campaign book, but he's not ruling out a run for president in 2016.

Walker told the Wisconsin State Journal in a story published Tuesday that he has a ``big, bold'' agenda for a second term, including overhauling entitlement programs like BadgerCare and tax reform.

Walker, in the interview conducted last week, did not reveal details of what his plans were.

Democrat Mary Burke has announced that she will run against Walker in 2014. No other candidate has emerged.

Walker has repeatedly refused to say whether he will serve his full term if elected. Release Tuesday of his book ``Unintimidated: A Governor's Story and a Nation's Challenge'' is fueling speculation that he will run for president.