The book has its own website. I guess that’s how things are done these days. The “discussion forum” looks pretty heavily monitored:

The Post-American Presidency Forum

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2010-07-26 20:28:27
Sara Palmer
Wow. That is a really good book.

2010-07-26 20:29:07
Jack Ben-Heim
This is a great book.

2010-07-29 02:28:59
thedametruth
This is what we’ve been waiting for, from two of the greatest, most well informed and hardworking patriots of our time!

2010-07-29 03:11:28
Joseph Samuel
This books it outsandingly outstanding.