Propaganda reaches into the realm of psychology. You would be surprised what's possible. Some points resonate a lot in place a while you can tell the exact opposite in place b with the same success - without getting into trouble.

Politicians do it all the time. Listen to a politician in a college speech and next day in a retirement home...


The whole thing isn't completely covered by science yet, so there's still some art involved. Imagine Rove/Cheney had applied their liar talents for useful purposes...

A small (sadly kinda mediocre) teaser on the topic:
http://www.newsweek.com/id/213625?from=rss