Elmer Gantry, a novel by Sinclair Lewis:
https://en.wikipedia.org/wiki/Elmer_Gantry
NPR novel review - hypocrisy of preachers and politicians:
http://www.npr.org/templates/story/story.php?storyId=19288767
YouTube novel review:
https://www.youtube.com/watch?v=LIwUbqPPvpE
Novel segment adapted for film:
https://en.wikipedia.org/wiki/Elmer_Gantry_(film)
New York Times movie review:
http://www.nytimes.com/movies/movie/15628/Elmer-Gantry/overview
Rotten Tomatoes movie review:
http://www.rottentomatoes.com/m/elmer_gantry/
"I'm On My Way" introductory scene:
https://www.youtube.com/watch?v=amznbi0lFaU
Final scene includes famous Bible quotation:
https://www.youtube.com/watch?v=e8FaDaTD_hA
Current expansion of hypnosis carnivals:
https://www.thirdday.com/tour
Example of pervasive political control carnivals:
http://www.shencofair.com/view.php?calendar-of-events