Coburn endorsed conservative activist and former diplomat Alan Keyes in the 2000 Republican presidential primaries. Coburn retired from Congress in 2001, fulfilling his pledge to serve no more than three terms in the House. His congressional district returned to the Democratic fold, as attorney Brad Carson defeated Andy Ewing, a Republican endorsed by Coburn. After leaving the House and returning to private medical practice, Coburn wrote "Breach of Trust", with ghostwriter John Hart, about his experiences in Congress. The book detailed Coburn's perspective on the internal Republican Party debates over the Contract With America and displayed his disdain for career politicians. Some of the figures he criticized (such as Gingrich) were already out of office at the time of the book's publishing, but others (such as former House Speaker Dennis Hastert) remained influential in Congress, which resulted in speculation that some congressional Republicans wanted no part of Coburn's return to politics.