I was doing a web search for an audio file of the Constitution and came across a website called "Learn Out Loud". On that site there is "The Founding Documents Podcast" and a description: "The Founding Documents Podcast is a periodic showcase presented in audio format. Here you will be able to listen to the declarations, speeches and essays that form the core principles of U.S. Government."
You have the choice of downloading the audio files or you can choose to listen to the audio stream right from the site:
http://www.learnoutloud.com/Catalog/Politics/U.S.-Government/The-Founding-Documents-Podcast/19473#3
or you can listen from iTunes:
http://itunes.apple.com/podcast/the-founding-documents-podcast/id182749680
I hope this tidbit of information is useful to fellow Appleseeders.
Listen and learn.
TruT.