Special guests on the August trip include Keillor, along with fellow cast members from the radio show -- Tim Russell, Sue Scott and Fred Newman -- and numerous musical guests, such as The DiGiallonardo Sisters, Bob Douglas and Richard Dworsky.

CNN: A cruise for everyone: 7 themed sailings

Prosecutors called Lawrence Busboon, ex-president of Sun Diamond Growers in California, to testimony about the activities of lobbyist Richard Douglas, a longtime friend of Espy.

CNN: By Paul Courson/

But some Republicans such as Richard Perle and Douglas Feith suggest that Mr Panetta's good political contacts will serve him well on Capitol Hill.

ECONOMIST: Leon Panetta and the state of American intelligence

The book is also said to include revelations about Michael Douglas, Sylvester Stallone and Richard Gere, but the tales about Stone have created the most interest.

BBC: Stone laughs off book claims

Two years ago, showbiz stars such as Angelina Jolie, Brad Pitt, Richard Gere and Michael Douglas stole the headlines.

BBC: NEWS | Business | Q&A: World Economic Forum 2008